Add CORS middleware and user database schema

- Implemented CORS middleware in the project to handle cross-origin requests.
- Added necessary files for the CORS package including README, LICENSE, and history documentation.
- Created a SQL schema for the users table with appropriate fields and constraints.
- Inserted mock data into the users table for testing purposes.

backend/.env

@@ -0,0 +1,4 @@
+DB_HOST=mysql
+DB_USER=root
+DB_PASSWORD=D7Ze0lwV9hMrNQHdz1Q8yi0MIQuOO8
+DB_NAME=bikelane