Add WebProxySettings (use when proxying requests) (#370)

* webproxy part 1

* fixed

* Push to MyGet

* WebProxy standalone

* -n true

* nuget --- "-n true"

* AllowAutoRedirect

* .

src/WireMock.Net/Settings/WebProxySettings.cs

@@ -0,0 +1,19 @@
+using JetBrains.Annotations;
+
+namespace WireMock.Settings
+{
+    public class WebProxySettings : IWebProxySettings
+    {
+        /// <inheritdoc cref="IWebProxySettings.Address"/>
+        [PublicAPI]
+        public string Address { get; set; }
+
+        /// <inheritdoc cref="IWebProxySettings.UserName"/>
+        [PublicAPI]
+        public string UserName { get; set; }
+
+        /// <inheritdoc cref="IWebProxySettings.Password"/>
+        [PublicAPI]
+        public string Password { get; set; }
+    }
+}