Adding additionalData property for storing additinal JSON properties

Author: Brian Melton

Templates/Android/generated/BaseEntity.java.tt

@@ -7,6 +7,8 @@
 
 import com.google.gson.JsonObject;
 import com.google.gson.annotations.*;
+import java.util.HashMap;
+import java.util.Map;
 
 <#=CreateClassDef(BaseTypeName(c), BaseClassName(c), "IJsonBackedObject")#>
 
@@ -16,6 +18,9 @@ import com.google.gson.annotations.*;
     @SerializedName("@odata.type")
     @Expose(serialize = false)
     public String oDataType;
+
+    @Expose(serialize = false)
+    public Map<String, Object> additionalData = new HashMap<>();
 <#
     }
 #>