added Features section in README.md

Author: Michaël Catanzariti

README.md

@@ -1,2 +1,11 @@
 # Dahomey.Cbor
 High-performance CBOR serialization framework for .Net
+
+## Features
+* Serialization/Deserialization from/to Streams, byte buffer
+* Object Model
+* Mapping to any .Net class
+* Extensible Polymorphism support based on discriminator conventions
+* Extensible Naming conventions
+* Custom converters for not supported types
+* [.Net standard 2.0](https://github.com/dotnet/standard/blob/master/docs/versions/netstandard2.0.md) support