Updated Request Matching (markdown)

Request-Matching.md

@@ -119,6 +119,7 @@ server
 
 ## CSharp Code (CSharpCodeMatcher)
 *Advanced!* With this matcher you can use complex C# code to match an JObject or string value.
+* You need to include the NuGet package [WireMock.Net.Matchers.CSharpCode](https://www.nuget.org/packages/WireMock.Net.Matchers.CSharpCode/)
 * Note that this functionality will only work if enabled in the settings (`AllowCSharpCodeMatcher = true`).
 * The argument-name from the string or JObject to match will be `it`.