Add Repetier-Server component documentation (#9362)

* Updated to newest developer version of Repetier platform

* ✏️ Tweak

After this we will merge it

* Added Repetier Logo file

source/_components/repetier.markdown

@@ -0,0 +1,111 @@
+---
+layout: page
+title: Repetier-Server Component
+description: "Instructions how to add Repetier-Server sensors to Home Assistant."
+date: 2019-05-01
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: repetier.png
+ha_category:
+  - Hub
+  - Sensor
+featured: false
+ha_release: 0.94
+ha_iot_class: Local Polling
+---
+
+[Repetier-Server](https://www.repetier-server.com/) is a 3D printer/CNC server, able to control multiple devices on the same server.
+This component handles the main integration to the server.
+
+There is currently support for the following device types within Home Assistant:
+
+- Sensor
+
+## {% linkable_title Configuration %}
+
+```yaml
+repetier:
+  - host: REPETIER_HOST
+    api_key: YOUR_API_KEY
+```
+
+{% configuration %}
+repetier:
+  type: list
+  required: true
+  keys:
+    host:
+      description: The host IP or hostname of your Repetier-Server.
+      required: true
+      type: string
+    api_key:
+      description: API-key for the user used to connect to Repetier-Server
+      required: true
+      type: string
+    port:
+      description: The port used to connect to the host
+      required: false
+      type: integer
+      default: 3344
+    sensors:
+      description: Configuration for the sensors.
+      required: false
+      type: map
+      keys:
+        monitored_conditions:
+          description: The sensors to activate.
+          type: list
+          default: all
+          keys:
+            "current_state":
+              description: Text of current state.
+            "extruder_temperature":
+              description: Temperatures of all available extruders. These will be displayed as `printer_name_extruder_N`.
+            "bed_temperature":
+              description: Temperatures of all available heated beds. These will be displayed as `printer_name_bed_N`.
+            "chamber_temperature":
+              description: Temperatures of all available heated chambers. These will be displayed as `printer_name_chamber_N`.
+            "current_job":
+              description: Returns percentage done of current job in state, and current job information as attributes.
+            "job_start":
+              description: Start timestamp of job start.
+            "job_end":
+              description: Estimated job end timestamp.
+{% endconfiguration %}
+
+Example with multiple Repetier Servers:
+
+```yaml
+repetier:
+  - host: REPETIER_HOST
+    api_key: YOUR_API_KEY
+    sensors:
+      monitored_conditions:
+        - 'current_state'
+        - 'current_job'
+  - host: REPETIER_HOST
+    api_key: YOUR_API_KEY
+    port: 3344
+```
+
+If the Repetier-Server host is equipped with a web camera it is possible to add this as well.
+
+```yaml
+camera:
+  - platform: mjpeg
+    name: Repetier
+    still_image_url: http://YOUR_REPETIER_HOST_IP:8080/?action=snapshot
+    mjpeg_url: http://YOUR_REPETIER_HOST_IP:8080/?action=stream
+```
+
+### {% linkable_title Retrieve API-key %}
+
+To generate the needed API-key do the following:
+
+* Go to your Repetier Server web-console
+* Push the settings icon (the gear icon)
+* Select User Profiles.
+* Create a new user, deselect all options and click Create User.
+* Edit the newly created user and take note of the API-key for this user, that's the one to use in the Home Assistant Settings