Update readme to note current repo state (#63292)

Author: RyanCavanaugh

README.md

@@ -27,6 +27,16 @@ npm install -D typescript@next
 
 ## Contribute
 
+**NOTE: Code changes in this repo are now limited to a small category of fixes**:
+
+ * Crashes that were introduced in 5.9 or 6.0 that *also* repro in 7.0 *and* have a portable fix *and* don't incur other behavioral changes
+ * Security issues
+ * Language service crashes that substantially impact mainline usage
+ * Serious regressions from 5.9 (these must *seriously* impact a *large* proportion of users)
+
+Most bug fixes should be submitted to the [typescript-go](https://github.com/microsoft/TypeScript-go) repository.
+Feature additions and behavorial changes are currently on pause until TypeScript 7.0 is completed.
+
 There are many ways to [contribute](https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md) to TypeScript.
 * [Submit bugs](https://github.com/microsoft/TypeScript/issues) and help us verify fixes as they are checked in.
 * Review the [source code changes](https://github.com/microsoft/TypeScript/pulls).