Create contributing.md

contributing.md

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+## Compiling and publishing binaries
+<details>
+  <summary>Directions for developers</summary>
+
+### PyPi
+PyPi builds *should* be automated by simply updating the trigger-actions branch, however, if you want to do it manually:
+
+1. Install build (`pip install build`) and twine (`pip install twine`)
+2. Create a Github release with a tag with the proper version number (if you want a dev release just skip this step; see https://packaging.python.org/en/latest/specifications/version-specifiers/ for proper version numbering)
+3. Run `python3 -m build `
+4. Run `twine upload dist/*`
+
+You may want to setup an API key for easier login, see https://packaging.python.org/en/latest/specifications/pypirc/#using-a-pypi-token
+
+### Pyinstaller
+Pyinstaller builds should be automated by pushing to the trigger-actions branch and binaries should be available in the actions tab.  However, if you'd prefer to build from source:
+
+1. Install PyInstaller (`pip install pyinstaller` or it may be present in a distro repository)
+2. Run `pyinstaller REVHubInterface.spec`
+3. The binary should be available in the `dist` folder
+
+### Flatpak
+Install Flatpak and flatpak-builder  
+TODO: finish this with Flathub directions
+
+</details>