Add Socialblade Markdown (#5237)

* Adding markdown and imagie for USCIS sensor

* Update the markdown

* Update sensor.uscis.markdown

* Update sensor.uscis.markdown

* Update sensor.uscis.markdown

* Minor changes

* Add :markdown for social blade

* Update links

* Update links

* Update sensor.uscis.markdown

* Remove USCIS docmenetation from this branch

* Update sensor.socialblade.markdown

* Update sensor.socialblade.markdown

source/_components/sensor.socialblade.markdown

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+---
+layout: page
+title: Social Blade Sensor
+description: "Instructions on how to set up Social Blade Sensor within Home Assistant."
+date: 2018-04-23 08:00
+sidebar: false
+comments: false
+sharing: true
+footer: true
+logo: socialblade.png
+ha_category: Sensor
+ha_release: 0.69
+ha_iot_class: "Cloud Polling"
+---
+
+The `socialblade` sensor component allows you get updates on a youtube channel using your social blade channel id. The sensor gets the subscribers and total views count  from [Social Blade Website]( https://socialblade.com/)
+
+to get the channel id you can go to [Social Blade Website]( https://socialblade.com/) and search for youtube channel by username, then select the channel and grab the id from the url. 
+The channel id will be the last part of the url :
+https://socialblade.com/youtube/channel/{channel_id}
+
+## Example for `configuration.yaml` :
+
+```yaml
+sensor:
+  - platform: socialblade
+    channel_id: YOUR_CHANNEL_NUMBER
+```
+
+{% configuration %}
+channel_id:
+  description: channel id number optained from the URL when you access Social Blade web client. 
+  required: true
+  type: string
+{% endconfiguration %}
+
+All the data will be fetch from  [Social Blade]( https://socialblade.com/).