feat(package.json): Add test:coverage script for checking test coverage

package.json

@@ -9,6 +9,7 @@
 		"dev": "tsx watch --no-warnings --clear-screen=false ./src/server.ts",
 		"build": "tsc",
 		"test": "echo 'not yet'",
+		"test:coverage": "echo 'not yet'",
 		"format:check": "prettier --check .",
 		"format:verbose": "prettier --write --cache .",
 		"format": "prettier --write --cache . > /dev/null",