Add nanoFramework.MessagePack (#218)

Author: networkfusion

azure-pipelines.yml

@@ -246,6 +246,8 @@ steps:
       
       git clone https://github.com/nanoframework/nanoFramework.Protobuf.git -b main libs/nanoFramework.Protobuf
 
+      git clone https://github.com/nanoframework/nanoFramework.MessagePack.git -b main libs/nanoFramework.MessagePack
+
   displayName: Clone repos of class libs
   condition: >-
     or(