Server support (stdio) (#19)

* Server support (stdio)
* TestServer project
* Refactored McpClient class to extract shared endpoint logic (with McpServer) to a base class, McpJsonRpcEndpoint.
* Improved xmldoc comments for protocol types, mirroring specification schema comments.
* Update README.MD

tests/mcpdotnet.Tests/ClientIntegrationTestFixture.cs

@@ -0,0 +1,50 @@
+using McpDotNet.Client;
+using McpDotNet.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace McpDotNet.Tests;
+
+public class ClientIntegrationTestFixture : IDisposable
+{
+    public ILoggerFactory LoggerFactory { get; }
+    public McpClientFactory Factory { get; }
+    public McpClientOptions DefaultOptions { get; }
+    public McpServerConfig DefaultConfig { get; }
+
+    public ClientIntegrationTestFixture()
+    {
+        LoggerFactory = Microsoft.Extensions.Logging.LoggerFactory.Create(builder =>
+            builder.AddConsole()
+            .SetMinimumLevel(LogLevel.Debug));
+
+        DefaultOptions = new()
+        {
+            ClientInfo = new() { Name = "IntegrationTestClient", Version = "1.0.0" }
+        };
+
+        DefaultConfig = new McpServerConfig
+        {
+            Id = "everything",
+            Name = "Everything",
+            TransportType = "stdio",
+            TransportOptions = new Dictionary<string, string>
+            {
+                ["command"] = "npx",
+                // Change to ["arguments"] = "mcp-server-everything" if you want to run the server locally after creating a symlink
+                ["arguments"] = "-y @modelcontextprotocol/server-everything",
+            }
+        };
+
+        // Inject the mock transport into the factory
+        Factory = new McpClientFactory(
+            [DefaultConfig],
+            DefaultOptions,
+            LoggerFactory
+        );
+    }
+
+    public void Dispose()
+    {
+        LoggerFactory?.Dispose();
+    }
+}