add Code of Conduct. Issue volosoft/vs-internal#1215

README.md

@@ -6,7 +6,7 @@
 [![NuGet (with prereleases)](https://img.shields.io/nuget/vpre/Volo.Abp.Core.svg?style=flat-square)](https://www.nuget.org/packages/Volo.Abp.Core)
 [![MyGet (nightly builds)](https://img.shields.io/myget/abp-nightly/vpre/Volo.Abp.svg?style=flat-square)](https://docs.abp.io/en/abp/latest/Nightly-Builds)
 [![NuGet Download](https://img.shields.io/nuget/dt/Volo.Abp.Core.svg?style=flat-square)](https://www.nuget.org/packages/Volo.Abp.Core)
-
+[![Code of Conduct](https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg)](https://github.com/abpframework/abp/blob/dev/CODE_OF_CONDUCT.md)
 [![ABP Discord server](https://img.shields.io/discord/951497912645476422?label=Discord)](https://discord.gg/abp)
 
 ABP Framework is a complete **infrastructure** based on **ASP.NET Core** to create **modern web applications** and **APIs** by following the software development **best practices** and the **latest technologies**. Check out https://abp.io