chore: add support policy

Author: zunderscore

.github/SUPPORT.md

@@ -1,2 +1,10 @@
+## Support Policy
+
+We will always support the latest stable Firebot release. Previous stable releases will be supported for **no more than 30 days** after a newer stable update has been released. After 30 days, you must be on a supported version in order to receive support via our official channels (Discord, GitHub, etc.).
+
+Pre-release versions (e.g. betas) are no longer supported **immediately** upon a corresponding stable release or if superseded by a newer pre-release (e.g. `5.66.0-beta1` would immediately become unsupported upon release of either `5.66.0-beta2` or a `5.66.0` stable release). Nightly releases continue to receive limited support due to their potentially unstable nature.
+
+
 ### Need help or have a question?
+
 Please feel free to stop by our [Discord](https://discord.gg/crowbartools-372817064034959370) or connect with us on [Bluesky](https://bsky.app/profile/firebot.app)!