docs: add readme

README.md

@@ -0,0 +1,17 @@
+# Polkadot Releases
+> ⚠️ NOTE: These builds are provided for development purposes only!
+
+This repo provides cross-platform builds of Polkadot and related binaries for usage with [`pop-cli`](https://github.com/r0gue-io/pop-cli) only. 
+
+Builds are generated using the release tags at https://github.com/paritytech/polkadot-sdk/releases, along with the Rust compiler version noted within the release notes of each release. 
+
+The [workflow](./.github/workflows/release.yml) generates the cross-platform binaries and creates a corresponding release with the same release tag. The corresponding commit hash is added to the release notes for additional verification.
+
+## Support Platforms
+The currently supported platforms/targets are as follows:
+- Linux
+ - `aarch64-unknown-linux-gnu`
+ - `x86_64-unknown-linux-gnu`
+- macOS
+ - `aarch64-apple-darwin`
+ - `x86_64-apple-darwin`