Init documentation on Triggers [ci skip]

doc/ci/README.md

@@ -2,34 +2,35 @@
 
 ### User documentation
 
-+ [Quick Start](quick_start/README.md)
-+ [Configuring project (.gitlab-ci.yml)](yaml/README.md)
-+ [Configuring runner](runners/README.md)
-+ [Configuring deployment](deployment/README.md)
-+ [Using Docker Images](docker/using_docker_images.md)
-+ [Using Docker Build](docker/using_docker_build.md)
-+ [Using Variables](variables/README.md)
-+ [Using SSH keys](ssh_keys/README.md)
+* [Quick Start](quick_start/README.md)
+* [Configuring project (.gitlab-ci.yml)](yaml/README.md)
+* [Configuring runner](runners/README.md)
+* [Configuring deployment](deployment/README.md)
+* [Using Docker Images](docker/using_docker_images.md)
+* [Using Docker Build](docker/using_docker_build.md)
+* [Using Variables](variables/README.md)
+* [Using SSH keys](ssh_keys/README.md)
+* [Triggering builds through the API](triggers/README.md)
 
 ### Languages
 
-+ [Testing PHP](languages/php.md)
+* [Testing PHP](languages/php.md)
 
 ### Services
 
-+ [Using MySQL](services/mysql.md)
-+ [Using PostgreSQL](services/postgres.md)
-+ [Using Redis](services/redis.md)
-+ [Using Other Services](docker/using_docker_images.md#how-to-use-other-images-as-services)
+* [Using MySQL](services/mysql.md)
+* [Using PostgreSQL](services/postgres.md)
+* [Using Redis](services/redis.md)
+* [Using Other Services](docker/using_docker_images.md#how-to-use-other-images-as-services)
 
 ### Examples
 
-+ [Test and deploy Ruby applications to Heroku](examples/test-and-deploy-ruby-application-to-heroku.md)
-+ [Test and deploy Python applications to Heroku](examples/test-and-deploy-python-application-to-heroku.md)
-+ [Test Clojure applications](examples/test-clojure-application.md)
-+ Help your favorite programming language and GitLab by sending a merge request with a guide for that language.
+* [Test and deploy Ruby applications to Heroku](examples/test-and-deploy-ruby-application-to-heroku.md)
+* [Test and deploy Python applications to Heroku](examples/test-and-deploy-python-application-to-heroku.md)
+* [Test Clojure applications](examples/test-clojure-application.md)
+* Help your favorite programming language and GitLab by sending a merge request with a guide for that language.
 
 ### Administrator documentation
 
-+ [User permissions](permissions/README.md)
-+ [API](api/README.md)
+* [User permissions](permissions/README.md)
+* [API](api/README.md)

doc/ci/triggers/README.md

+# Triggering Builds through the API
+
+_**Note:** This feature was [introduced][ci-229] in GitLab CE 7.14_
+
+Triggers can be used to force a rebuild of a specific branch or tag with an API
+call.
+
+## Add a trigger
+
+
+[ci-229]: https://gitlab.com/gitlab-org/gitlab-ci/merge_requests/229