Added documentation for new lock support

source/_components/lock.markdown

@@ -0,0 +1,27 @@
+---
+layout: component
+title: "Locks"
+description: "Instructions how to setup your locks with Home Assistant."
+date: 2015-11-21 08:10
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Keeps track which locks are in your environment, their state and allows you to control them.
+
+ * Maintains a state per lock and a combined state `all_locks`.
+ * Registers services `lock/lock` and `lock/unlock` to control locks.
+
+### {% linkable_title Use the services %}
+
+Go the the **Developer Tools**, then to **Call Service** in the frontend, and choose `lock/lock` or `lock/unlock` from the list of available services (**Available services:** on the left). Enter something like the sample below into the **Service Data** field and hit **CALL SERVICE**.
+
+```json
+{"entity_id":"lock.front_door"}
+```
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `entity_id`            |      yes | Only act on specific lock. Else targets all.