Add basic README.md

README.md

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+# flatpak-repo
+
+A minimal HTTP server for hosting an OSTree/Flatpak repository, written in Rust with Axum.
+
+Includes a non-standard route for uploading flatpak bundles:
+
+    curl -v -XPOST -T ./org.example.Example.aarch64.flatpak http://localhost:3000/flatpak-bundle/upload