* Add PubMatic bidder doc file (prebid#1255)

* Add app video capability to PubMatic bidder info file

docs/bidders/pubmatic.md

@@ -0,0 +1,33 @@
+# PubMatic Bidder
+
+## Test Request
+
+The following test parameters can be used to verify that Prebid Server is working properly with the 
+PubMatic adapter. This example includes an `imp` object with an PubMatic test publisher ID, ad slot,
+and sizes that would match with the test creative.
+
+```
+"imp":[
+      {
+         "id":“"some-impression-id”,
+         "banner":{
+            "format":[
+               {
+                  "w":300,
+                  "h":250
+               },
+               {
+                  "w":300,
+                  "h":600
+               }
+            ]
+         },
+         "ext":{
+            "pubmatic":{
+               "publisherId":“156276”,
+               "adSlot":"pubmatic_test"
+            }
+         }
+      }
+   ]
+```

static/bidder-info/pubmatic.yaml

@@ -4,6 +4,7 @@ capabilities:
   app:
     mediaTypes:
       - banner
+      - video
   site:
     mediaTypes:
       - banner