Add example of Coding Agent with AgentKit (#55)

examples/agentkit-coding-agent/.env.example

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+E2B_API_KEY=your_e2b_api_key # Get one at https://e2b.dev/docs
+ANTHROPIC_API_KEY=your_anthropic_api_key # Get one at https://console.anthropic.com/settings/keys

examples/agentkit-coding-agent/README.md

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+# AgentKit Coding Agent with E2B Code Interpreter
+
+This example demonstrates how to build an AI coding agent using AgentKit and E2B Code Interpreter. The agent can execute code and help with programming tasks.
+
+## Setup
+
+1. Install dependencies:
+
+```bash
+npm install
+```
+
+2. Create a `.env` file in the root of the project with the following environment variables:
+
+```bash
+E2B_API_KEY=your_e2b_api_key # Get one at https://e2b.dev/docs
+ANTHROPIC_API_KEY=your_anthropic_api_key # Get one at https://console.anthropic.com/settings/keys
+```
+
+3. Start the program:
+
+```bash
+npm run start
+```
+
+4. Start the Inngest Dev Server:
+
+```bash
+npx inngest-cli@latest dev
+```
+
+5. Open the Inngest Dev Server at [http://127.0.0.1:8288/functions](http://127.0.0.1:8288/functions)
+
+![Inngest Dev Server](./readme-assets/inngest-functions-list.png)
+
+6. Trigger the Coding Agent with the following input:
+
+```json
+{
+  "data": {
+    "input": "Create a Next.js TodoList demo and its associated unit tests. Finally run the tests with coverage"
+  }
+}
+```
+
+![Inngest Dev Server](./readme-assets/inngest-trigger-coding-agent.png)
+
+7. The agent will start executing the task and you will see the output in the Inngest Dev Server.
+
+![Inngest Dev Server](./readme-assets/inngest-coding-agent-run.png)
+
+## Features
+
+- Code execution using E2B Code Interpreter
+- Built with AgentKit for robust agent capabilities
+- TypeScript support
+- Hot reloading during development
+- Durable execution (retries on rate limits, etc) with Inngest
+
+## Project Structure
+
+The project uses TypeScript and is set up with the following key dependencies:
+
+- `@e2b/code-interpreter`: For code execution capabilities
+- `@inngest/agent-kit`: For building the AI agent
+- `zod`: For runtime type checking
+- `typescript`: For static type checking