Created Device controls (markdown)

Device-controls.md

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+Each virtual device comes with a set of emulated video controls (brightness, contrast, gain, etc.) that you can apply in the client side.  
+
+**Note**: MacOS doesn't not provides any API for managing the webcam controls, however you can still set the controls from the manager.  
+
+You can list the device controls with:
+
+```
+AkVCamManager controls AkVCamVideoDevice0
+```
+
+You can get the current value of the control with:
+
+```
+AkVCamManager get-control AkVCamVideoDevice0 CONTROL_NAME
+```
+
+And you can get the controls parameters with:
+
+```
+AkVCamManager get-control --description AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --type AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --min AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --max AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --step AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --default AkVCamVideoDevice0 CONTROL_NAME
+AkVCamManager get-control --menu AkVCamVideoDevice0 CONTROL_NAME
+```
+
+You can set one or many controls at same time in the form of **CONTROL_NAME=VALUE** as:
+
+```
+AkVCamManager set-controls AkVCamVideoDevice0 CONTROL_1=VALUE CONTROL_2=VALUE...
+```