Add link to TIOBE Index on main page + fix issues (#1137)

* Add TIOBE + include SonarAnalyzer.CSharp

* .

* cp

* Copyright © WireMock.Net

* more fixes

* fix

* xpath

* if (Matchers == null || !Matchers.Any())

* if (Matchers != null)

* ?

* .

* .

src/WireMock.Net/Http/ByteArrayContentHelper.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System.Net.Http;
 using System.Net.Http.Headers;
 using Stef.Validation;

src/WireMock.Net/Http/HttpClientBuilder.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System.Net;
 using System.Net.Http;
 using WireMock.HttpsCertificate;

src/WireMock.Net/Http/HttpClientFactory2.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System.Linq;
 using System.Net.Http;
 

src/WireMock.Net/Http/HttpKnownHeaderNames.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.

src/WireMock.Net/Http/HttpRequestMessageHelper.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System;
 using System.Collections.Generic;
 using System.Linq;

src/WireMock.Net/Http/HttpResponseMessageHelper.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System;
 using System.Collections.Generic;
 using System.Linq;

src/WireMock.Net/Http/StringContentHelper.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System.Net.Http;
 using System.Net.Http.Headers;
 using Stef.Validation;

src/WireMock.Net/Http/WebhookSender.cs

@@ -1,3 +1,5 @@
+// Copyright © WireMock.Net
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;