feat: Initialize test-ai-sdk project with Bun

- Add README.md with installation and usage instructions.
- Create bun.lock and pnpm-lock.yaml for dependency management.
- Implement main functionality in index.ts to test AI providers.
- Add opencode.json configuration for various AI providers.
- Create package.json to define project dependencies and scripts.
- Add TypeScript configuration in tsconfig.json for project setup.
- Implement test scripts for different AI providers in src directory.

README.md

@@ -0,0 +1,15 @@
+# test-ai-sdk
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.3.6. [Bun](https://bun.com) is a fast all-in-one JavaScript runtime.