add logo

Author: Oceania2018

README.md

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 # TensorFlow.NET
+![logo](docs/assets/tf.net.logo.svg)
+
 TensorFlow.NET (TF.NET) provides a .NET Standard binding for [TensorFlow](https://www.tensorflow.org/). It aims to implement the complete Tensorflow API in CSharp which allows .NET developers to develop, train and deploy Machine Learning models with the cross-platform .NET Standard framework. 
 
 [![Join the chat at https://gitter.im/publiclab/publiclab](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/sci-sharp/community)
@@ -186,6 +188,8 @@ Feel free to star or raise issue on [Github](https://github.com/SciSharp/TensorF
 
 Join our chat on [Gitter](https://gitter.im/sci-sharp/community) or
 
+![SciSharp](https://avatars3.githubusercontent.com/u/44989469)
+
 Scan QR code to join Tencent TIM group:
 
 ![SciSharp STACK](docs/TIM.jpg)