build(cli): add a pnpm run dev command

Add a `pnpm run dev` command to make testing/development easier.

Author: aloisklink

packages/cli/README.md

@@ -73,3 +73,8 @@ updated:
 $ mermaid-chart pull ./path/to/my/mermaid-digram.mmd
 ❌ - ./path/to/my/mermaid-digram.mmd would be updated
 ```
+
+## Contributing
+
+For local development and testing, you can `pnpm dev` to run the CLI,
+`pnpm run lint` to run linting, and `pnpm test` to run unit tests.

packages/cli/package.json

@@ -12,6 +12,7 @@
     "node": "^18.18.0 || ^20.0.0"
   },
   "scripts": {
+    "dev": "tsx src/cli.ts",
     "lint": "eslint src/ && prettier --check src/",
     "lint:fix": "eslint --fix src/ && prettier --write src/",
     "prepare": "tsc --build tsconfig.json",
@@ -45,6 +46,7 @@
     "@typescript-eslint/eslint-plugin": "^6.11.0",
     "@typescript-eslint/parser": "^6.11.0",
     "eslint": "^8.54.0",
+    "tsx": "^3.12.8",
     "typescript": "^5.2.2",
     "vitest": "^0.34.6"
   },