docs(readme): add migration instructions

Added a new section to the README with instructions for running database
migrations using the `migrate` commands. Included details for both
standard and fresh migrations, as well as a note about the migration
reset behavior. This helps new contributors set up the database schema
before starting the service.

Author: Kocannn

README.md

@@ -30,6 +30,20 @@ To set up your environment variables:
 
     Make sure to replace placeholder values with actual data where necessary.
 
+### Running Migrations
+
+Before starting the service, you need to run the database migrations to set up the necessary tables and schema. The project uses `migrate` for managing database migrations.
+
+```bash
+    go run main.go migrate:up
+```
+Or if you want to run with seeder you can run this command
+
+```bash
+    go run main.go migrate:fresh
+```
+But it will be down your migration first
+
 ### Running the Service
 
 To run `lms-be` on your local machine, you have two options: