Update index.md

Author: CodeWithSushil

docs/index.md

@@ -5,3 +5,15 @@ title: Supabase
 
 ### Welcome to Supabase client for PHP.
 This is a Documention of Supabase Client for PHP.
+
+### Install
+```bash
+composer require sushilk/supabasse
+```
+
+### Setup `.env`
+```env
+URL=https://<project id>.supabase.co
+API_KEY=jK2jfiirdif
+AUTH_TOKEN=fiirit949rrTolen
+```