add release doc

documentation/internal/Release.md

@@ -0,0 +1,15 @@
+# Releasing KubeMarine
+
+If you want to make a new KubeMarine release, you need to do following:
+1. Update KubeMarine version and create tag (replace `X.X.X` with actual version):
+    ```
+    python3 -m pip install bumpver
+    python3 -m bumpver update --set-version=X.X.X
+    ```
+2. Wait for GitHub Actions completion and verify released artifacts. Following artifacts are essential for each tag:
+    * KubeMarine binaries for different OS. They could be found in release assets.
+    * KubeMarine python distribution package. They could be found in release assets.
+    * [KubeMarine image](https://github.com/Netcracker/KubeMarine/pkgs/container/kubemarine).
+    * [Kubemarine documentation](https://github.com/Netcracker/KubeMarine/tree/main/documentation).
+
+3. Once you have verified that KubeMarine artifacts are OK, change your release from `pre-release` to `latest release` on [GitHub Release page](https://github.com/Netcracker/KubeMarine/releases). This will publish KubeMarine distribution package to PyPI.