[Internal] Versioning: Adds guidance for versioning SDK releases

README.md

@@ -36,6 +36,8 @@ using (FeedIterator<dynamic> feedIterator = container.GetItemQueryIterator<dynam
 
 `Install-Package Microsoft.Azure.Cosmos`
 
+For available versions, see [SDK versioning](./docs/versioning.md).
+
 ## Useful links
 
 - [Get Started APP](https://docs.microsoft.com/azure/cosmos-db/sql-api-get-started)

docs/versioning.md

@@ -0,0 +1,50 @@
+# Versioning
+
+The Azure Cosmos DB SDK ships two [Nuget package](https://www.nuget.org/packages/Microsoft.Azure.Cosmos) versions:
+
+* GA SDK: Versioned with `3.X.Y`, it contains APIs and features that are considered General Availability
+* Preview SDK: Versioned with `3.(X + 1).0-preview.Y`, it contains APIs and features that are in Preview. These APIs or features might be service features that are in Preview (such as a new Cosmos DB Service feature or operation) or SDK client specific features that are unrelated to a service feature (such as improvements in connection handling).
+
+> :information_source: General Availability of an API or feature present in a Preview SDK is not guaranteed on the next GA SDK release following the Preview SDK release when it was introduced. Each Preview API can have an independent GA cycle that can be dependent on the Azure Cosmos DB Service.
+
+## Major releases
+
+Major releases are defined by:
+
+* Significant breaking changes to the API surface of the SDK.
+* Significant breaking changes to dependencies
+
+> :information_source: No new major release is currently planned.
+
+## Minor releases
+
+Minor releases are defined by: 
+
+* Changes in the public API surface of the SDK, such as new features, or GAing APIs that were in preview
+* Changes in the version of one of the dependencies
+
+In these cases, the **GA SDK** should **increase the minor version** and **Preview SDK** should **increase the minor version to be one more than GA SDK**.
+
+For example, if `3.10.0` is being released for **GA SDK**, then `3.11.0-preview.0` should be released for **Preview SDK**.
+
+## Patch releases
+
+Patch releases are defined by:
+
+* No Public API changes
+* Includes a subset of the bug fixes reported after the last major release
+
+In these cases, the **GA SDK** should **increase the patch version** and **Preview SDK** should **increase the preview suffix version**.
+
+For example, if `3.10.0` is being patched, for **GA SDK** we would release `3.10.1` and for **Preview SDK** we would release `3.11.0-preview.1`.
+
+If `3.10.1` is being patched, for **GA SDK** we would release `3.10.2` and for **Preview SDK** we would release `3.11.0-preview.2`.
+
+## Complete full example
+
+| GA         | Preview     |
+|----------|-----------|
+| 3.10.0 | 3.11.0-preview.0 |
+| 3.10.1 | 3.11.0-preview.1 |
+| 3.10.2 | 3.11.0-preview.2 |
+| 3.11.0 | 3.12.0-preview.0 |