Add a custom long description for PyPi

setup/long_description.md

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+<img src="https://raw.githubusercontent.com/vkbo/novelWriter/main/setup/novelwriter.png">
+
+novelWriter is a plain text editor designed for writing novels assembled from many smaller text
+documents. It uses a minimal formatting syntax inspired by Markdown, and adds a meta data syntax
+for comments, synopsis, and cross-referencing. It's designed to be a simple text editor that allows
+for easy organisation of text and notes, using human readable text files as storage for robustness.
+
+The project storage is suitable for version control software, and also well suited for file
+synchronisation tools. All text is saved as plain text files with a meta data header, the core
+project structure is stored in a single project XML file, and other meta data is primarily saved as
+JSON files.
+
+The application is written in Python 3 (3.6+) using Qt5 and PyQt5 (5.3+). It is developed on Linux,
+but should in principle work fine on other operating systems as well as long as dependencies are
+met. It is regularly tested on Debian and Ubuntu Linux, Windows, and macOS.
+
+novelWriter is developed and maintained by [Veronica Berglyd Olsen](https://github.com/vkbo).
+
+**Website:** https://novelwriter.io  
+**Documentation:** https://novelwriter.readthedocs.io  
+**Source Code:** https://github.com/vkbo/novelWriter