Add basic go application and remove python code

CONTRIBUTING.md

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+# Contributing
+
+There are multiple ways to contribute code to this project:
+
+* Submit a Pull Request on
+[https://git.suruatoel.xyz/coderkun/mcg](git.suruatoel.xyz/coderkun/mcg) or
+[https://codeberg.org/suruatoel/mcg](codeberg.org/suruatoel/mcg)
+* Send a git pull request via eMail
+* Send a patch via eMail
+
+## Internationalization
+
+Update `.pot` files:
+
+    $ xgettext --language=Go --keyword=T --from-code=UTF-8 --package-name=mcg --output=po/mcg-go.pot $(git ls-files '*.go')
+    $ xgettext --language=Glade --from-code=UTF-8 --output=po/mcg-ui.pot $(git ls-files '*.ui')
+    $ msgcat --use-first -o po/mcg.pot po/mcg-go.pot po/mcg-ui.pot
+
+Use a tool like [Poedit](https://poedit.net/) to create or update translations
+in the `locale/` folder.
+
+## AI Policy
+
+This project uses a _No AI policy_. Any code you submit to this project has to
+be written by yourself. If you put this project’s code into any AI tool, you
+will be banned from this project.