Update readme

Author: coderstrong

README.md

@@ -1,2 +1,4 @@
 # MakeSimple.Logging
 Make Simple .NET logging config and tracing
+
+[![Build status](https://ci.appveyor.com/api/projects/status/eau3dun5q5d7wwi9/branch/main?svg=true)](https://ci.appveyor.com/project/coderstrong/makesimple-logging/branch/main) [![NuGet Version](https://img.shields.io/nuget/v/MakeSimple.Logging.svg?style=flat)](https://www.nuget.org/packages/MakeSimple.Logging/) [![NuGet Downloads](https://img.shields.io/nuget/dt/MakeSimple.Logging.svg)](https://www.nuget.org/packages/MakeSimple.Logging/) 

appveyor.yml

@@ -1,7 +1,7 @@
 version: 1.0.{build}
 branches:
   only:
-  - develop
+  - main
 image: Visual Studio 2019
 dotnet_csproj:
   patch: true