Add readme file

Author: waylan

README.md

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+# Python-Markdown Dingus
+
+A simple site for testing Python-Markdown as well as the backend called by [Babelmark].
+Visit <http://waylan.pythonanywhere.com/dingus> for a live demo.
+
+[Babelmark]: http://johnmacfarlane.net/babelmark2/
+
+# Setup
+
+To set up a dev environment, clone this repo and create a virtual environment. Then
+install the dependencies.
+
+```bash
+python -m venv venv
+. venv/bin/activate
+pip install -r requirements.txt
+```
+
+After a new release of Python-Markdown has been made, update with:
+
+```bash
+pip install -U markdown
+```
+
+# Running the server
+
+To run a local instance of the server for development and testing:
+
+```bash
+python dingus.py
+```
+
+Then point your browser at <http://localhost:8080/dingus>.
+
+# Copyright and License
+
+[Markdown] and [Dingus] Copyright &copy; 2004 [John Gruber]<br />
+Additions and Modifications to Dingus (extension support, etc.) Copyright &copy; 2012-2020 [Waylan Limberg]
+
+[Markdown]: http://daringfireball.net/projects/markdown/
+[Dingus]: http://daringfireball.net/projects/markdown/dingus
+[John Gruber]: http://daringfireball.net/colophon/
+[Waylan Limberg]: https://github.com/waylan