Add triggers doc in top level readme [ci skip]

doc/README.md

@@ -28,17 +28,18 @@
 - [Using SSH keys](ci/ssh_keys/README.md)
 - [User permissions](ci/permissions/README.md)
 - [API](ci/api/README.md)
+- [Triggering builds through the API](ci/triggers/README.md)
 
 ### CI Languages
 
-+ [Testing PHP](ci/languages/php.md)
+- [Testing PHP](ci/languages/php.md)
 
 ### CI Services
 
-+ [Using MySQL](ci/services/mysql.md)
-+ [Using PostgreSQL](ci/services/postgres.md)
-+ [Using Redis](ci/services/redis.md)
-+ [Using Other Services](ci/docker/using_docker_images.md#how-to-use-other-images-as-services)
+- [Using MySQL](ci/services/mysql.md)
+- [Using PostgreSQL](ci/services/postgres.md)
+- [Using Redis](ci/services/redis.md)
+- [Using Other Services](ci/docker/using_docker_images.md#how-to-use-other-images-as-services)
 
 ### CI Examples