Give an overview of our stability guarantees

Author: Enselic

src/stability-guarantees.md

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+# Stability guarantees
+
+This page gives an overview of what our stability guarantees are.
+
+## RFCs
+
+* [RFC 1105 api evolution](https://github.com/rust-lang/rfcs/blob/master/text/1105-api-evolution.md)
+* [RFC 1122 language semver](https://github.com/rust-lang/rfcs/blob/master/text/1122-language-semver.md)
+
+## Blog posts
+
+* [Stability as a Deliverable](https://blog.rust-lang.org/2014/10/30/Stability/)
+
+## rustc-dev-guide links
+
+* [Stabilizing library features](./stability.md)
+* [Stabilizing language features](./stabilization_guide.md)
+* [What qualifies as a bug fix?](./bug-fix-procedure.md#what-qualifies-as-a-bug-fix)
+
+## Exemptions
+
+Even if some of our infrastructure can be used by others, it is still considered
+internal and comes without stability guarantees. This is a non-exhaustive list
+of components without stability guarantees:
+
+* The CLIs and environment variables used by `remote-test-client` / `remote-test-server`