Add release docs

RELEASE.md

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+# Release process
+
+1. Bump the version number in `setup.cfg` and `singlestoredb/__init__.py` using
+   semantic versioning rules: minor bump for new features, patch bump for
+   bug fixes.
+
+2. Add release notes to `docs/src/whatsnew.rst`.
+
+3. Run `SINGLESTOREDB_URL=root:@db-server:db-port make html` in `docs/src` to
+   generate documentation. You will need `sphinx` and `sphinx_rtd_theme` installed
+   for this step. You also need a SingleStoreDB server running at the given
+   IP and port to run samples against.
+
+4. Commit all changed files with a commit like "Prepare for vX.X.X release".
+
+5. The coverage tests will be triggered by the push, but you should also run
+   `Smoke test` workflow manually which does basic tests on all supported versions
+   of Python.
+
+6. Once all workflows are clean, create a new Github release with the name
+   "SingleStoreDB vX.X.X" and set the generated tag to the matching version
+   number. Add the release notes from the `whatsnew.rst` file to the release
+   notes. Creating the release will run the `Public packages` workflow which
+   builds the packages and pubsishes them to PyPI.