Add market restriction note (#4571)

source/_components/mercedesme.markdown

@@ -21,6 +21,10 @@ This component provides the following platforms:
  - Sensors - such as fuel status, service interval, remaining km...
  - Device tracker - to track location of your car
 
+<p class='note warning'>
+  The component can integrate cars out of the European and Africa markets only.  
+</p>
+
 To use Mercedes me in your installation, add the following to your `configuration.yaml` file:
 
 ```yaml
@@ -30,7 +34,6 @@ mercedesme:
   password: password
 ```
 
-
 {% configuration %}
 username:
   description: The email address associated with your Mercedes me account.