Simplify client samples (#14)

- Remove duplicate projects
- Replace client sample with a simple chat app

samples/ChatWithTools/Program.cs

@@ -0,0 +1,52 @@
+using ModelContextProtocol.Client;
+using ModelContextProtocol.Protocol.Transport;
+using Microsoft.Extensions.AI;
+using OpenAI;
+
+// Connect to an MCP server
+Console.WriteLine("Connecting client to MCP 'everything' server");
+var mcpClient = await McpClientFactory.CreateAsync(
+    new()
+    {
+        Id = "everything",
+        Name = "Everything",
+        TransportType = TransportTypes.StdIo,
+        TransportOptions = new()
+        {
+            ["command"] = "npx", ["arguments"] = "-y @modelcontextprotocol/server-everything",
+        }
+    },
+    new() { ClientInfo = new() { Name = "ChatClient", Version = "1.0.0" } });
+
+// Get all available tools
+Console.WriteLine("Tools available:");
+var tools = await mcpClient.GetAIFunctionsAsync();
+foreach (var tool in tools)
+{
+    Console.WriteLine($"  {tool}");
+}
+Console.WriteLine();
+
+// Create an IChatClient. (This shows using OpenAIClient, but it could be any other IChatClient implementation.)
+// Provide your own OPENAI_API_KEY via an environment variable.
+using IChatClient chatClient =
+    new OpenAIClient(Environment.GetEnvironmentVariable("OPENAI_API_KEY")).AsChatClient("gpt-4o-mini")
+    .AsBuilder().UseFunctionInvocation().Build();
+
+// Have a conversation, making all tools available to the LLM.
+List<ChatMessage> messages = [];
+while (true)
+{
+    Console.Write("Q: ");
+    messages.Add(new(ChatRole.User, Console.ReadLine()));
+
+    List<ChatResponseUpdate> updates = [];
+    await foreach (var update in chatClient.GetStreamingResponseAsync(messages, new() { Tools = [.. tools] }))
+    {
+        Console.Write(update);
+        updates.Add(update);
+    }
+    Console.WriteLine();
+
+    messages.AddMessages(updates);
+}