added description for Qt Marketplace

doc/qtmarketplace_metadata/jkqtplotter_decsription.md

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+# JKQTPlotter - A Qt Plotting Library
+This is an extensive Qt5 Plotter framework (including a feature-richt plotter widget, a speed-optimized, but limited variant and a LaTeX equation renderer!), written fully in C/C++ and without external dependencies.
+
+This software is licensed under the term of the [GNU Lesser General Public License 2.1 
+(LGPL 2.1)](./LICENSE) or above. 
+
+* SourceRepositpry: https://github.com/jkriege2/JKQtPlotter
+* Latest Release: https://github.com/jkriege2/JKQtPlotter/releases
+* Documentation: https://jkriege2.github.io/JKQtPlotter/index.html
+* Examples: https://jkriege2.github.io/JKQtPlotter/example_tutorial_projects.html
+* Screenshots: https://github.com/jkriege2/JKQtPlotter/tree/master/screenshots
+
+![EXAMPLES-Page](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/examplesbanner.png)
+
+## Main Features
+- 2D Plotter widget class (JKQTPlotter)
+  - high-quality plotting
+  - no other dependencies than Qt >= 5.0
+  - highly customizable axes/grids (linear/log, date/time, custom ticks ...)
+  - integrated LaTeX parser (pure C++, no dependencies) to render mathematical equations in axis labels, ticks, ...
+  - extensive user-interactions pre-programmed (several zooming modes, selecting regions, custom context menus, switch graph visibility, ...)
+  - full print and export (PDF,PNG,...) support with preview and parametrization out-the-box
+  - highly customizable look and feel
+  - supports the Qt layout system for graphs and allows to symchronize several graphs with each other
+- centralized data management in an internal datastore:
+  - data organized by columns, can also represent image data (ropw-major)
+  - allows to reuse a column in several graphs
+  - access via Qt's model view framework
+  - external or internal datasets
+  - complete with GUI (table view)
+  - export capabilities (e.g. to CSV, SYLK, ...)
+  - C++ standard iterator interface
+  - statistics library (basic statistics, boxplots, histograms, kernel density estimates, regression analysis, polynomial fitting)
+- large variety of graphs that can be added to a plot, e.g.:
+  - scatter-plots (also parametrized color/size/symbol by a third data-column)
+  - line graphs, step graphs, impulses
+  - filled curves
+  - barcharts (also stacked)
+  - extensive support for different styles of error indicators
+  - integrated mathematical function parser for function plots (with intelligent rendering algorithm)
+  - line/scatter graphs can also be based on C/C++ functions instead of data series (C++11 support!)
+  - statistical plots (e.g. boxplots)
+  - extensive library of image plots (inclusing different color-scale modes, RGBA-plots, overlays/masks)
+  - contour plots
+  - geometric forms/annotations
+  - can be easily extended by deriving a new graph from JKQTPPlotElement or JKQTPPlotObject
+- optional: OpenCV, CImg interfaces
+- CMake-based build system
+- extensive set of Examples/Tutorials: https://jkriege2.github.io/JKQtPlotter/example_tutorial_projects.html
+- extensive doxygen-generated Documentation: http://jkriege2.github.io/JKQtPlotter/index.html
+
+## Building
+
+* Latest Release: [![Lates Release](https://img.shields.io/github/v/release/jkriege2/JKQtPlotter)](https://github.com/jkriege2/JKQtPlotter/releases)
+
+JKQTPlotter contains two different build systems: A modern [CMake](https://cmake.org/)-based build and an older (and deprecated!) QMake-based build (which works out of the box with Qt 5.x). Both systems are explained in detail in http://jkriege2.github.io/JKQtPlotter/page_buildinstructions.html.
+
+
+With [CMake](https://cmake.org/) you can easily build JKQTPlotter and all its examples, by calling something like:
+```
+    $ mkdir build; cd build
+    $ cmake .. -G "<cmake_generator>" "-DCMAKE_PREFIX_PATH=<path_to_your_qt_sources>"
+    $ cmake --build . --config "Debug"
+```
+
+## Screenhhots
+
+### Plotting
+
+![Diverse Plots](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/datastore_groupedstat.png)
+![Function Plotting](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/functionplot.png)
+![Log-Axes](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/logaxes.png)
+![Plot Symbols](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/symbols_and_styles.png)
+![Error Indicators](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/errorbarstyles.png)
+![Plot Styling](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/stylesbanner.png)
+![Parametrized Plots](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/paramscatterplot.png)
+![Boxplots](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/test_styledboxplot.png)
+![Violin Plots](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/violinplot_vert.png)
+![Statistics Library](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/datastore_regression.png)
+![Scatter Plot](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/paramscatterplot_image.png)
+![Image Plot](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_modifier.png)
+![Multi-Plots, 2D Histograms](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/datastore_statistics_2d_histcontour.png)
+![Contour Plot Animation](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/contourplot_animated.gif)
+![Geometric Plots](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/geometric.png)
+
+### LaTeX-Rendering
+![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/mscreen_schroedinger.png)
+
+## Build-In User-Interaction
+![Zooming](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/doc/images/zoomin_mouse_contextmenu.gif)
+![Tooltips](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/doc/images/tooltiptool.gif)
+![Measure-Tool](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/doc/images/rulertool.gif)

doc/qtmarketplace_metadata/qtmarketplace.json

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+{
+    "$schema": "http://qt.io/schema/extension-schema-v1#",
+    "title": "JKQtPlotter",
+    "extensionType": [
+        "library"
+    ],
+    "version": "2019.11.3",
+    "vendor": {
+        "name": "Jan Krieger",
+        "url": "http://www.jkrieger.de"
+    },
+    "contact": "Jan Krieger <jan@jkrieger.de>",
+    "copyright": [ "Jan Krieger" ],
+    "author": "Jan Krieger",
+    "icon": "https://github.com/jkriege2/JKQtPlotter/raw/master/doc/images/logo.png",
+    "licenses": [
+      { "licenseType": "LGPLv2.1+",
+        "licenseUrl": "https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/LICENSE" }
+    ],
+    "created": "2008",
+    "lastUpdate": "2020-06-28",
+    "platforms": [
+        "Windows", "macOS", "Linux"
+    ],
+    "qtVersions": [
+        "5.0-or-later"
+    ],
+    "tags": [
+        "WIDGET", "SCIENTIFIC COMPUTING", "CHART", "GUI", "GRAPHICS", "DATA", "MATH", "LATEX" ],
+    "price": {
+        "listprice": 0
+    },
+    "support": "https://github.com/jkriege2/JKQtPlotter/issues",
+    "bugUrl": "https://github.com/jkriege2/JKQtPlotter/issues",
+    "sourceRepoUrl": "https://github.com/jkriege2/JKQtPlotter",
+	"userManuals": "http://jkriege2.github.io/JKQtPlotter/index.html",
+    "dependencies": [
+        "Core", "GUI", "Widgets"
+    ]
+}