Add RELEASE_GUIDE.md (purescript#1073)

* Add release guide * Add note about purescript-metadata; fix numbers
AlexRogalskiy · Feb 27, 2022 · 3b51084 · 3b51084
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+# Release Guide
+
+1. If a new PureScript version has been made, push a new empty commit to `purescript/purescript-metadata` using the name of the tag: `git commit --allow-empty -m "v0.14.7" && git tag v0.14.7 && git push && git push v0.14.7`
+
+2. If a new PureScript version has been made, submit and get merged a PR to [`justinwoo/easy-purescript-nix`](https://github.com/justinwoo/easy-purescript-nix) that adds a file for the next purescript version. See [justinwoo/easy-purescript-nix#170](https://github.com/justinwoo/easy-purescript-nix/pull/170) for an example.
+
+```sh
+PURS_VERSION=v0.14.7
+nix-prefetch-url "https://github.com/purescript/purescript/releases/download/$PURS_VERSION/macos.tar.gz"
+nix-prefetch-url "https://github.com/purescript/purescript/releases/download/$PURS_VERSION/linux64.tar.gz"
+```
+
+3. Submit and get merged a PR to this repo with the following changes:
+    - If a new PureScript version has been meade, upgrade this repo's `default.nix` file to the latest version of `easy-purescript-nix`
+    - Update this repo's `release.sh`'s `LATEST_PURS` variable to the latest version (e.g. `0.14.7`)
+
+4. Run `./release.sh` locally