Add release.md with 1.1.0 changelog

Author: jiwon-oai

docs/release.md

@@ -0,0 +1,24 @@
+# Release process/changelog
+
+The project follows a slightly modified version of [semantic versioning](https://semver.org/spec/v2.0.0.html). The SDK is still evolving and certain backwards-incompatible changes may be released as minor versions.
+
+## Minor versions
+
+We will increase minor versions for **breaking changes** to any public interfaces. For example, going from `1.0.x` to `1.1.x` might include breaking changes.
+
+If you don't want breaking changes, we recommend pinning to `1.0.x` versions in your project.
+
+## Patch versions
+
+We will increment patch versions for non-breaking changes:
+
+- Bug fixes
+- New features
+- Changes to private interfaces
+
+## Breaking change changelog
+
+### 1.1.0
+
+- `CustomSummary`, `CustomTask`, and `EntitySource` types have been updated to restrict `icon` to `IconName`.
+- All `_to_input` methods on `ThreadItemConverter` have been updated to be asynchronous.

mkdocs.yml

@@ -53,6 +53,7 @@ nav:
           - store: api/chatkit/store.md
           - types: api/chatkit/types.md
           - widgets: api/chatkit/widgets.md
+  - Release process / changelog: release.md
   - ChatKit JS Docs: https://openai.github.io/chatkit-js/
 markdown_extensions:
   - pymdownx.superfences:
@@ -76,4 +77,4 @@ extra_css:
   - stylesheets/extra.css
 
 watch:
-  - chatkit
+  - chatkit