Adds maintainers guide with release process (#637)

Authored-by: Wayne Adams <[email protected]>

MAINTAINERS_GUIDE.md

@@ -0,0 +1,28 @@
+# Maintainer's Guide Notes
+
+## Release Process
+
+We use [GoReleaser]() to do the heavy lifing when releasing new versions of [om](https://github.com/pivotal-cf/om).
+
+It will create a new GitHub release, attach the binaries, and update the Homebrew formula.
+
+Here's a quick rundown of the process:
+
+1. Make sure you have the latest version of GoReleaser installed. See [install instructions](https://goreleaser.com/install/).
+
+2. Ensure you have explorted your GitHub token as an environment variable.
+    ```
+    export GITHUB_TOKEN=<your_token>
+    ```
+3. Create a new tag for the release. 
+    ```
+    git tag -a <Major.Minor.Patch> -m "Release v<version>"
+    git push origin <Major.Minor.Patch>
+    ```
+
+4. Run GoReleaser to create the release.
+    ```
+    goreleaser release
+    ```
+
+5. Edit the newly created release on [GitHub](https://github.com/pivotal-cf/om/releases). There's feature to automatically create release notes between two tags. Use it and then clean up redundant or uninformative entries. See these [instructions](https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository#editing-a-release) for more information.