Adds RELEASE manual (#28)

* Adds RELEASE manual

* Clean release documentation

* Adds pre-release checklist

RELEASE.md

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+## Moonbeam Release Process
+
+### Branches
+
+- Releases are taken from the branch `master` using tags `vX.X.X`
+
+### Notes
+
+- The `master` branch must refer to frontier `paritytech/frontier/master` or
+  `purestake/frontier/vX.X-hotfixes`
+
+### Pre-Release Checklist
+
+- [ ] Purge requirement has been communicated and scheduled with ops
+- [ ] Purge announcement has been prepared and scheduled
+- [ ] Documentation/Website/Tutorials have been updated
+- [ ] Runtime version has been updated
+- [ ] Tests are passing on StageNet
+- [ ] Ensure Type changes are reflected into PolkadotJs
+
+### Release Workflow
+
+Below are the steps of the release workflow. Steps prefixed with NOACTION are
+automated and require no human action.
+
+1. To initiate the release process, tag the current master.
+
+   - `git checkout master; git pull; git tag -a v0.3.0 -m 'Moonbase v0.3.0'; git push origin v0.3.0`
+
+2. NOACTION: The docker image is built with the given tag
+3. NOACTION: Produce release draft including binaries & specs
+4. Complete the draft with information from PRs
+5. Publish the release
+
+### Post-Release Checklist
+
+- [ ] Release note contains all meaningful notes
+- [ ] Release note contains binaries and specs