Axis documentation (#2549)

* First draft of Axis component documentation

* Small improvements

* Added information about lowest supported Axis firmware

* Trigger time better explains functionality than scan interval

* Simplified explanation of automatic discovery

* Rephrasing manually configuring device

* Keep first and second level variables separated for ease of reading

* Moved up dependency and used Hassbian paths as an example

* Indented include variables descriptions to clarify their relation

* Made configuration variables tile linkable

* Axis devices are part of the discovery mechanism

* Update axis.markdown

* Update binary_sensor.axis.markdown

* Update camera.axis.markdown

source/_components/axis.markdown

@@ -0,0 +1,75 @@
+---
+layout: page
+title: "Axis"
+description: "Instructions on how to setup devices from Axis Communications within Home Assistant."
+date: 2017-04-30 23:04
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: axis.png
+ha_category: Hub
+ha_release: "0.45"
+---
+
+[Axis Communications](https://www.axis.com/) devices are surveillance cameras and other security related network connected hardware. Sensor API works with firmware 5.50 and newer.
+
+Home Assistant will automatically discover their presence on your network.
+
+You can also manually configure your devices by adding the following lines to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+axis:
+  m1065lw:
+    host: IP ADDRESS
+    username: USERNAME
+    password: PASSWORD
+    include:
+    - camera
+    - motion
+    - pir
+    - audio
+    - daynight
+    trigger_time: 0
+    location: köket
+```
+
+## {% linkable_title Dependencies %}
+
+```bash
+sudo apt-get install python3-gi gir1.2-gstreamer-1.0
+```
+
+Depending on how you run Home Assistant you might be needed to symlink the `gi` module into your environment (e.g. in Hassbian):
+
+```bash
+ln -s /usr/lib/python3/dist-packages/gi /srv/homeassistant/lib/python3.4/site-packages
+```
+
+## {% linkable_title Configuration variables % }
+
+- **device** (*Required*): Unique name 
+- **host** (*Required*): The IP address to your Axis device.
+- **username** (*Optional*): The username to your Axis device. Default 'root'.
+- **password** (*Optional*): The password to your Axis device. Default 'pass'.
+- **trigger_time** (*Optional*): Minimum time (in seconds) a sensor should keep its positive value. Default 0.
+- **location** (*Optional*): Physical location of your Axis device. Default not set.
+
+- **include** (*Required*): This cannot be empty else there would be no use adding the device at all.
+  - **camera**: Stream MJPEG video to Home Assistant
+  - **motion**: The Built in motion detection in Axis cameras
+  - **vmd3**: ACAP Motion Detection app which has better algorithms for motion detection
+  - **pir**: PIR sensor that can trigger on motion
+  - **sound**: Sound detector
+  - **daynight**: Certain cameras have day/night mode if they have built-in IR lights
+  - **tampering**: signals when camera believes that it has been tampered with
+  - **input**: trigger on whatever you have connected to device input port
+
+<p class='note'>
+Any specific levels for triggers needs to be configured on the device.
+</p>
+
+<p class='note'>
+  It is recommended that you create a user on your Axis device specifically for Home Assistant. For all current functionality it is enough to create a user belonging to user group viewer.
+</p>