remove cross platform project

Author: UnixY2K

README.md

@@ -67,7 +67,7 @@ after the dll is compiled, you can use it from the C# project.
 
 ## Multiplatform Support
 
-the SDK (C#) is only available for Windows, IOS and Android, for this example exists `csharp-cross-platform.csproj` and `source.cs`.
+the SDK (C#) is only available for Windows, IOS and Android.
 
 ## AppCenter Callbacks
 

csharp/csharp-cross-platform.csproj

@@ -8,10 +8,6 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Compile Remove="source\source.cs" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.AppCenter" Version="4.4.0" />
     <PackageReference Include="Microsoft.AppCenter.Analytics" Version="4.4.0" />