Feat/mcp example (#284)

# Pull Request Description
 
This PR adds an example for the MCP server

examples/agent-kit-mcp-server/.gitignore

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+.env
+node_modules
+build

examples/agent-kit-mcp-server/README.md

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+<div align="center">
+
+# Solana Agent Kit MCP Server
+## SendAI
+
+</div>
+
+A Solana Agent Kit implementation using the Model Context Protocol (MCP) for handling protocol operations on the Solana blockchain.
+
+## Features
+
+- Supports all actions from the Solana Agent Kit
+- MCP server implementation for standardized interactions
+- Environment-based configuration
+
+## Prerequisites
+
+- Node.js (v16 or higher recommended)
+- pnpm or yarn or npm
+- Solana wallet with private key
+- Solana RPC URL
+
+## Installation
+
+```bash
+pnpm install
+```
+
+## Configuration
+
+1. Configure the `claude_desktop_config.json` file by editing the `env` fields.
+
+```env
+SOLANA_PRIVATE_KEY=your_private_key_here
+RPC_URL=your_solana_rpc_url_here
+```
+
+2. Change the Claude Desktop MCP server settings:
+
+For MacOS:
+```bash
+code ~/Library/Application\ Support/Claude/claude_desktop_config.json
+```
+
+For Windows:
+```bash
+code $env:AppData\Claude\claude_desktop_config.json
+```
+
+The final configuration should look like the following (replace the path with your absolute project path):
+
+```json
+{
+    "mcpServers": {
+        "agent-kit": {
+            "command": "node",
+            "env": {
+                "RPC_URL": "your_solana_rpc_url_here",
+                "SOLANA_PRIVATE_KEY": "your_private_key_here"
+            },
+            "args": [
+                "/ABSOLUTE/PATH/TO/YOUR/PROJECT"
+            ]
+        }
+    }
+}
+```
+
+Note: Make sure to restart Claude Desktop after updating the configuration and building the project.
+
+## Building the Project
+
+To build the project, run:
+
+```bash
+pnpm run build
+```
+
+This will compile the TypeScript code and set the appropriate permissions for the executable.
+
+## Project Structure
+
+- `src/` - Source code directory
+- `src/index.ts` - Main entry point implementing the MCP server
+
+## Dependencies
+
+- [solana-agent-kit](https://github.com/sendaifun/solana-agent-kit): Core functionality for Solana blockchain interactions
+- [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk): MCP implementation
+- dotenv: Environment variable management
+- zod: Runtime type checking
+
+## License
+
+ISC
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.

examples/agent-kit-mcp-server/claude_desktop_config.json

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+{
+    "mcpServers": {
+        "agent-kit": {
+            "command": "node",
+            "env" : {
+                "OPENAI_API_KEY": "optional_openai_api_key_here",
+                "RPC_URL": "your_rpc_url_here",
+                "SOLANA_PRIVATE_KEY": "your_private_key_here"
+            },
+            "args": [
+                "/absolute/path/to/build/index.js"
+            ]
+        }
+    }
+}

examples/agent-kit-mcp-server/package.json

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+{
+  "name": "agent-kit",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "bin": {
+    "weather": "./build/index.js"
+  },
+  "scripts": {
+    "build": "tsc && node -e \"require('fs').chmodSync('build/index.js', '755')\""
+  },
+  "files": [
+    "build"
+  ],
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.5.0",
+    "dotenv": "^16.4.7",
+    "solana-agent-kit": "1.4.8",
+    "zod": "^3.24.2"
+  },
+  "devDependencies": {
+    "@types/node": "^22.13.4",
+    "typescript": "^5.7.3"
+  }
+}