Add Release instructions

RELEASE.md

@@ -0,0 +1,22 @@
+# Release Instructions
+
+This project is using [TravisCI](https://travis-ci.org/) to automatically
+publish git tags to [npm](https://www.npmjs.com/).
+
+Follow these steps to create a new release:
+
+1) `yarn changelog` – generates the changelog for the new release
+
+2) Add generated changelog to `CHANGELOG.md` and commit with
+   `Update CHANGELOG` message 
+
+3) `yarn version` – updates the `version` property in the `package.json`
+   file and creates a new git commit and tag for the release
+
+4) `git push upstream master --follow-tags` – pushes the release commit and
+   tag to the `upstream` remote
+
+5) Wait for TravisCI to finish the build, tests and deployment
+
+Note that for `yarn version` to work properly the `version` field should not
+be adjusted manually before the release.