Add README with migration script usage instructions

README_MIGRATION.md

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+# Database Migration Script
+
+This script addresses the issue where `init-db.sh` skipped adding new columns to existing tables.
+
+## Usage
+
+1. Make sure you have access to the PostgreSQL database
+2. Run the migration script:
+   ```bash
+   ./migration-fix-columns.sh
+   ```
+
+## What it does
+
+The script adds missing columns to existing tables in the database. It uses `ALTER TABLE ... ADD COLUMN IF NOT EXISTS` statements to ensure that:
+1. If a column already exists, it won't cause an error
+2. If a column doesn't exist, it will be added
+
+## Affected Tables
+
+- rooms
+- places
+- menu_items
+- users
+- reservations
+- social_events
+- reviews
+- social_event_reservations
+- calendar_events
+- room_comments
+- offers
+- coupons
+- benefits
+- slides
+- config
+
+## Columns Added
+
+- photos (TEXT[])
+- featured_photo (VARCHAR(500))
+- first_name (VARCHAR(255))
+- last_name (VARCHAR(255))
+- comments_disabled (BOOLEAN DEFAULT false)