Created DEPLOYMENT (markdown)

DEPLOYMENT.md

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+### Private
+
+These are the steps to deploy a new version of Rambox here.
+
+1. Upload the new release for Windows, Mac and Linux to Github with all the Changelog, and save it as a draft.
+2. Change the website and README.md to update if is necessary.
+3. Release the version in Github.
+4. Go to Heroku instance and in Resources tab, disable Dynos and enable it again (if no version detected yet, we have to force it).
+5. Go to Firebase and update with the new version to notify users.