chore(sdk): make kfp-kubernetes release instructions public (#10693)

Signed-off-by: connor-mccarthy <mccarthy.connor.james@gmail.com>

kubernetes_platform/python/RELEASE.md

@@ -0,0 +1,38 @@
+## kfp-kubernetes release instructions
+
+Some steps require elevated permissions to push branches, publish the package, and release documentation. However, anyone can perform step 1 to begin the process.
+
+1.  [No permissions required] Update the package version in
+    [`__init__.py`](https://github.com/kubeflow/pipelines/blob/master/kubernetes_platform/python/kfp/kubernetes/__init__.py)
+    and add a documentation version to the
+    [`version_info` array](https://github.com/kubeflow/pipelines/blob/0907a1155b393516b4f8de8561467dbb1f9be5da/kubernetes_platform/python/docs/conf.py#L140).
+
+    **Create and merge the PR into the `master` branch.**
+
+2.  [Requires repo OWNER permissions]  Replace the `KFP_KUBERNETES_VERSION` value with the version in
+    `__init__.py`, then run the following commands:
+
+    ```
+    KFP_KUBERNETES_VERSION=0.0.1 # replace with correct version
+    cd kubernetes_platform/python
+    source create_release_branch.sh
+    ```
+
+    Follow the instructions printed out by the script in Step 2, which explain how to push the branch to upstream.
+
+    By the end, you
+    should have pushed a modified `__init__.py`, `conf.py`, `.gitignore`, and
+    two modified `.readthedocs.yml` files to the release branch.
+
+4.  [Requires credentials] Go to
+    [readthedocs.org/projects/kfp-kubernetes/](https://readthedocs.org/projects/kfp-kubernetes/),
+    click "Versions" in the menu panel, and
+    search for the correct branch to activate the version. Make sure the docs
+    build.
+
+5.  [Requires credentials] From the `kubernetes_platform/python` directory with
+    `KFP_KUBERNETES_VERSION` set, run:
+
+    ```
+    source release.sh
+    ```