Add c-sharp generation settings to readme (#3894)

Author: markcowl

specification/fluidrelay/resource-manager/readme.md

@@ -87,4 +87,14 @@ See configuration in [readme.typescript.md](./readme.typescript.md)
 
 ## CSharp
 
-See configuration in [readme.csharp.md](./readme.csharp.md)
+```yaml $(csharp)
+csharp:
+  azure-arm: true
+  license-header: MICROSOFT_MIT_NO_VERSION
+  payload-flattening-threshold: 1
+  clear-output-folder: true
+  client-side-validation: false
+  namespace: Microsoft.FluidRelay
+  output-folder: $(csharp-sdks-folder)/fluidrelay/management/Microsoft.FluidRelay/GeneratedProtocol
+```
+