Move some classes and restructure.

src/WireMock/Matchers/Request/RequestMessageVerbMatcher.cs

@@ -0,0 +1,40 @@
+using JetBrains.Annotations;
+using WireMock.Validation;
+
+namespace WireMock.Matchers.Request
+{
+    /// <summary>
+    /// The request verb matcher.
+    /// </summary>
+    internal class RequestMessageVerbMatcher : IRequestMatcher
+    {
+        /// <summary>
+        /// The _verb.
+        /// </summary>
+        private readonly string _verb;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RequestMessageVerbMatcher"/> class.
+        /// </summary>
+        /// <param name="verb">
+        /// The verb.
+        /// </param>
+        public RequestMessageVerbMatcher([NotNull] string verb)
+        {
+            Check.NotNull(verb, nameof(verb));
+            _verb = verb.ToLower();
+        }
+
+        /// <summary>
+        /// Determines whether the specified RequestMessage is match.
+        /// </summary>
+        /// <param name="requestMessage">The RequestMessage.</param>
+        /// <returns>
+        ///   <c>true</c> if the specified RequestMessage is match; otherwise, <c>false</c>.
+        /// </returns>
+        public bool IsMatch(RequestMessage requestMessage)
+        {
+            return requestMessage.Verb == _verb;
+        }
+    }
+}