Instance: a way to check if we have Pleroma with Mastodon API extensions

app/src/main/java/com/keylesspalace/tusky/entity/Instance.kt

@@ -43,6 +43,10 @@ data class Instance (
         val instance = other as Instance?
         return instance?.uri.equals(uri)
     }
+    
+    fun isPleroma(): Boolean {
+        return version.contains(" (compatible; Pleroma ");
+    }
 }
 
 data class PollLimits (