Add LTS branch information

readme.md

@@ -48,6 +48,22 @@ Here is what you can expect Microsoft Support to be able to help with:
 * [Azure IoT Hub documentation][iot-hub-documentation]
 * [Node.js API reference documentation][node-api-reference].
 
+## Long Term Support branches
+
+The project is using LTS branches to allow users that do not need the latest and greatest features to be shielded from unwanted changes.
+
+An LTS branch will be created every 6 months. The lifetime of an LTS branch is currently 1 year.
+LTS branches receive all bug fixes that fall in one of these categories:
+
+- security bugfixes
+- critical bugfixes (crashes, memory leaks, etc.)
+
+No new features or improvements will be picked up on LTS branches.
+
+LTS branches are named lts_*mm*_*yyyy*, where *mm* and *yyyy* are the month and year when the branch was created. An example of such a branch is *lts_03_2017*.
+
+![](./lts_branches.png)
+
 ---
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.