Update supabase.md

Author: samestrin

supabase.md

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+# url-shortening-api-netlify-edge-supabase
+
+## Supabase Setup
+
+Setting up Supabase for your project involves a few key steps, from creating an account to initializing your database and integrating it with your application. Here’s a detailed walkthrough:
+
+**Sign Up and Create a New Project**:
+
+Visit [Supabase](https://supabase.io/) and sign up for a new account if you don't already have one.
+
+Once logged in, create a new project by specifying a project name, database password, and the region closest to your users to minimize latency.
+
+**Project Setup**:
+
+After your project is created, which might take a few minutes, you will be redirected to the project dashboard.
+
+Your project’s URL (`SUPABASE_URL`) and anon key (`SUPABASE_ANON_KEY`), which are required for connecting your application to Supabase, can be found under the `Settings` -> `API` section of your Supabase project dashboard.
+
+## Database Configuration
+
+Create Tables: Use the SQL editor in Supabase to create the necessary tables for your application. For the URL shortener, you’ll need a table to store URLs with columns for the short URL and the original URL.
+
+```sql
+CREATE TABLE urls (
+  id SERIAL PRIMARY KEY,
+  short_url VARCHAR(255) UNIQUE NOT NULL,
+  long_url VARCHAR(2048) NOT NULL
+);
+```
+
+**Row Level Security (RLS)**:
+
+Enable RLS for your tables to ensure that your data is secure and accessible only according to your specified policies.