DOC: deviceatlas: more example use cases.

In addition of adding additional headers examples, some examples of
defining an ACL.
diff --git a/README b/README
index cf97605..a99b845 100644
--- a/README
+++ b/README
@@ -251,23 +251,33 @@
 
 There are two distinct methods available, one which leverages all HTTP headers
 and one which uses only a single HTTP header for the detection. The former
-method is highly recommended and more accurate.
+method is highly recommended and more accurate. There are several possible use
+cases.
 
+# To transmit the DeviceAtlas data downstream to the target application
 
-All HTTP headers
+All HTTP headers via the sample / fetch
 
+    http-request set-header X-DeviceAtlas-Data %[da-csv-fetch(primaryHardwareType,osName,osVersion,browserName,browserVersion)]
 
-      http-request set-header X-DeviceAtlas-Data %[da-csv-fetch(primaryHardwareType,osName,osVersion,browserName,browserVersion)]
+Single HTTP header (e.g. User-Agent) via the convertor
 
+    http-request set-header X-DeviceAtlas-Data %[req.fhdr(User-Agent),da-csv-conv(primaryHardwareType,osName,osVersion,browserName,browserVersion)]
 
-Single HTTP header (e.g. User-Agent)
+# Mobile content switching with ACL
+
+All HTTP headers
 
+    acl is_mobile da-csv-fetch(mobileDevice) 1
 
-      http-request set-header X-DeviceAtlas-Data %[req.fhdr(User-Agent),da-csv-conv(primaryHardwareType,osName,osVersion,browserName,browserVersion)]
+Single HTTP header
 
+    acl device_type_tablet req.fhdr(User-Agent),da-csv-conv(primaryHardwareType) "Tablet"
+
 
 Please find more information about DeviceAtlas and the detection methods at https://deviceatlas.com/resources .
 
+
 1.2) 51Degrees Device Detection
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