Document MSRV policy

Author: pascalkuthe

.github/workflows/msrv-rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.59.0"
+channel = "1.61.0"
 components = ["rustfmt", "rust-src"]

README.md

@@ -76,6 +76,11 @@ Helix can be installed on MacOS through homebrew:
 brew install helix
 ```
 
+## Minimum Stable Rust Version (MSRV) Policy
+
+Helix follows the MSRV of firefox.
+The current MSRV and future changes to the MSRV are listed in the [firefox documentation](https://firefox-source-docs.mozilla.org/writing-rust-code/update-policy.html).
+
 # Contributing
 
 Contributing guidelines can be found [here](./docs/CONTRIBUTING.md).