chore: Update README.md with basic usage instructions

README.md

@@ -1,5 +1,23 @@
 # Legendary
 
+# Up and Running
+
+In order to start the server, run `script/server`. Any dependencies required
+will be installed automatically using [brew](https://brew.sh/),
+[asdf](https://asdf-vm.com/#/), and [hex](https://hex.pm/).
+
+Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
+
+# CI Configuration
+
+Legendary comes with gitlab CI settings which should work for you with minimal
+setup.
+
+The CI script will automatically tag successful builds. To do this, you will
+need to configure a [CI variable](-/settings/ci_cd) named `GITLAB_TOKEN`. This
+token should be a [personal access token](/-/profile/personal_access_tokens) with
+`read_repository, write_repository` permissions.
+
 To start your Phoenix server:
 
   * Install dependencies with `mix deps.get`
@@ -7,11 +25,7 @@ To start your Phoenix server:
   * Install Node.js dependencies with `npm install` inside the `assets` directory
   * Start Phoenix endpoint with `mix phx.server`
 
-Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
-
-Ready to run in production? Please [check our deployment guides](https://hexdocs.pm/phoenix/deployment.html).
-
-## Learn more
+# Learn more
 
   * Official website: https://www.phoenixframework.org/
   * Guides: https://hexdocs.pm/phoenix/overview.html