Add Gitlab documentation

docs/gitlab-webhooks.markdown

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+Gitlab webhooks
+===============
+
+Gitlab events can be connected to Kanboard automatic actions.
+
+List of supported events
+------------------------
+
+- Gitlab commit received
+- Gitlab issue opened
+- Gitlab issue closed
+
+List of supported actions
+-------------------------
+
+- Create a task from an external provider
+- Close a task
+
+Configuration
+-------------
+
+[INSERT SCREENSHOT]
+
+1. On Kanboard, go to the project settings and choose the section **Integrations**
+2. Copy the Gitlab webhook url
+3. On Gitlab, go to the project settings and go the section **Webhooks**
+4. Check the boxes **Push Events** and **Issues Events**
+5. Paste the url and save
+
+Examples
+--------
+
+### Close a Kanboard task when a commit pushed to Gitlab
+
+- Choose the event: **Gitlab commit received**
+- Choose the action: **Close the task**
+
+When one or more commits are sent to Gitlab, Kanboard will receive the information, each commit message with a task number included will be closed.
+
+Example:
+
+- Commit message: "Fix bug #1234"
+- That will close the Kanboard task #1234
+
+### Create a Kanboard task when a new issue is opened on Gitlab
+
+- Choose the event: **Gitlab issue opened**
+- Choose the action: **Create a task from an external provider**
+
+When a task is created from a Gitlab issue, the link to the issue is added to the description and the task have a new field named "Reference" (this is the Gitlab ticket number).
+
+### Close a Kanboard task when an issue is closed on Gitlab
+
+- Choose the event: **Gitlab issue closed**
+- Choose the action: **Close the task**