Update readme.md

Author: rafek1241

readme.md

@@ -1,5 +1,7 @@
 # XML Serializer for ReBus
 
+[![.NET Core](https://github.com/rafek1241/ReBus.Serializer.XML/actions/workflows/dotnet.yml/badge.svg)](https://github.com/rafek1241/ReBus.Serializer.XML/actions/workflows/dotnet.yml)
+
 ## Why it was created?
 
 To make transition from NServiceBus MSMQ to ReBus as much painless as possible.
@@ -44,4 +46,4 @@ This serializer **does not** support serialization/deserialization of collection
 
 ## Contribution
 
-It would be great if you guys would help me improve this or bring up any issues. I will work on them in free time.
+It would be great if you guys would help me improve this or bring up any issues. I will work on them in free time.