Add Django, Rails integration instructions to docs and move cli login to overview page

docs/integrations/frameworks/rails.mdx

@@ -2,4 +2,20 @@
 title: "Ruby on Rails"
 ---
 
-Instructions coming soon.
+Prerequisite: [Install the CLI](/cli/overview)
+
+## Initialize Infisical for your [Rails](https://rubyonrails.org) app
+
+```bash
+# move to your Rails app
+cd /path/to/project
+
+# initialize infisical
+infisical init
+```
+
+## Start your server with environment variables injected
+
+```bash
+infisical run -- bin/rails server
+```