Update README.md

Author: JDSRAO

README.md

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-# CodeExecutor
-Dynamic Code Executors
+# Dynamic Code Executor
+
+[![NuGet version (CodeExecutor)](https://img.shields.io/nuget/v/CodeExecutor.svg?style=flat-square)](https://www.nuget.org/packages/CodeExecutor/)
+
+This repository contains helper dotnet classess for dynamic code compilation and execution.
+
+Supported languages 
+- C#
+- JavaScript