Adding markdown and imagie for USCIS sensor (#5138)

* Adding markdown and imagie for USCIS sensor

* Update the markdown

* Update sensor.uscis.markdown

* Update sensor.uscis.markdown

* Update sensor.uscis.markdown

* Minor changes

source/_components/sensor.uscis.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: USCIS Sensor
+description: "Instructions on how to set up USCIS within Home Assistant."
+date: 2018-03-21 08:00
+sidebar: false
+comments: false
+sharing: true
+footer: true
+logo: uscis.jpg
+ha_category: Sensor
+ha_release: 0.68
+ha_iot_class: "Cloud Polling"
+---
+
+The `uscis` sensor component allows you get updates on your USCIS case using your case/receipt number. The sensor gets the case information from [USCIS Website]( https://egov.uscis.gov/casestatus/landing.do)
+
+## Example for `configuration.yaml` :
+
+```yaml
+sensor:
+  - platform: uscis
+    case_id: YOUR_CASE_NUMBER
+    name: OPTIONAL_NAME
+```
+
+{% configuration %}
+friendly_name:
+  description: Name of the sensor in Home Assistant.
+  required: false
+  default: USCIS
+  type: string
+case_id:
+  description: Case/receipt number used to get the case details from USCIS web client. 
+  required: true
+  type: string
+{% endconfiguration %}
+
+All the data will be fetch from  [USCIS](https://egov.uscis.gov/casestatus/mycasestatus.do).