Create USAGE.md

USAGE.md

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+# The ClassicPress Theme
+
+This repository does not contain the theme's code.
+**It's used only to host releases.**
+
+The theme code is in the [ClassicPress repository](https://github.com/ClassicPress/ClassicPress) at `src/wp-content/themes/the-classicpress-theme`.
+
+## How to release
+- Go to the Releases section of this repo
+- Draft a new release
+- Be sure to put a tag consistent with the theme version
+- Publish the release
+
+The code will be fetched from the ClassicPress repo and zipped. The ZIP file is attached to the release.
+
+<img width="617" alt="Schermata 2024-06-07 alle 10 53 52" src="https://github.com/ClassicPress/the-classicpress-theme/assets/29772709/56e68e48-6017-4539-90d4-6aef7f77b285">