Updating readme

Author: pfwd

README.md

@@ -16,3 +16,7 @@ php artisan serve
 3. Open app in browser
 Open `http://127.0.0.1:8000/api/`
 
+# Lessons
+1. [Install API Platform](./docs/lessons/1_install_api_platform.md)
+2. [CI/CD with GitHub](./docs/lessons/2_ci_cd.md)
+3. [Host multiple sites](./docs/lessons/3_host_multiple_sites.md)