Add basic readme with showcase image

README.md

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+# DarkTitleBar
+
+A very simple minecraft mod to add a dark-mode title bar on Windows 10 1809
+and above. (only if your system is in dark mode)
+
+This mod does **not** require the Fabric API.
+
+This mod does not support forge for now, maybe sometime.
+
+## Contributing
+
+Since this is a very simple mod, I doubt there will be many issues or
+contributions, but any are welcome!
+
+If you find a bug or want to make a feature request, make an [issue][1].
+
+If you want to fix a bug or add a feature, make sure it has an issue first,
+then make a [pull request][2] with your changes.
+
+[1]: https://git.froggi.es/williamist/DarkTitleBar/issues
+[2]: https://git.froggi.es/williamist/DarkTitleBar/pulls
+
+## Screenshot
+
+Here is a screenshot of the mod in use:
+
+![A minecraft window with the title bar dark instead of the default light](/assets/showcase.png)