chore: document releasing igniter

RELEASE.md

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+# Releasing igniter
+
+This documents the method of releasing igniter. You first need access to both the hex package
+and the GH repo.
+
+## `mix git_ops.release`
+
+Run `mix git_ops.release` to generate a new changelog and bump the version.
+
+This will instruct you to then run `git push --follow-tags`. You can also
+modify the changelog while the prompt is active and before confirming if
+you want to clean it up a bit. I typically format the file and adjust things
+to make it a bit clearer.
+
+## `mix hex.publish`
+
+You *typically* won't need to do this, but if CI fails for some reason, or you are in a hurry,
+you can run `mix hex.publish` to publish the hex package. CI will fail if you publish it
+before CI gets to tha step. This is fine.
+
+## publishing the installer `igniter_new`
+
+The process for this is less rigorous. You manually bump the verison in `installer/mix.exs`,
+cd into `/installer` and then run `mix hex.publish`, and thats it :)
+If you've published a new version of `igniter` that should affect what version the
+installer uses, edit `@igniter_version` module attribute in `installer/lib/mix/tasks/igniter.new.ex`
+to match the new requirement.