Create WireMock.Net.ProtoBuf project (#1350)

* Create WireMock.Net.ProtoBuf project

* ok

* Update Directory.Build.props

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/WireMock.Net.Shared/ResponseBuilders/IProxyResponseBuilder.cs

@@ -0,0 +1,35 @@
+// Copyright © WireMock.Net
+
+using System.Security.Cryptography.X509Certificates;
+using WireMock.Settings;
+
+namespace WireMock.ResponseBuilders;
+
+/// <summary>
+/// The ProxyResponseBuilder interface.
+/// </summary>
+public interface IProxyResponseBuilder : IStatusCodeResponseBuilder
+{
+    /// <summary>
+    /// WithProxy URL using Client X509Certificate2.
+    /// </summary>
+    /// <param name="proxyUrl">The proxy url.</param>
+    /// <param name="clientX509Certificate2ThumbprintOrSubjectName">The X509Certificate2 file to use for client authentication.</param>
+    /// <returns>A <see cref="IResponseBuilder"/>.</returns>
+    IResponseBuilder WithProxy(string proxyUrl, string? clientX509Certificate2ThumbprintOrSubjectName = null);
+
+    /// <summary>
+    /// WithProxy using <see cref="ProxyAndRecordSettings"/>.
+    /// </summary>
+    /// <param name="settings">The ProxyAndRecordSettings.</param>
+    /// <returns>A <see cref="IResponseBuilder"/>.</returns>
+    IResponseBuilder WithProxy(ProxyAndRecordSettings settings);
+
+    /// <summary>
+    /// WithProxy using <see cref="X509Certificate2"/>.
+    /// </summary>
+    /// <param name="proxyUrl">The proxy url.</param>
+    /// <param name="certificate">The X509Certificate2.</param>
+    /// <returns>A <see cref="IResponseBuilder"/>.</returns>
+    IResponseBuilder WithProxy(string proxyUrl, X509Certificate2 certificate);
+}