tsc building script

ref #1

package.json

@@ -24,6 +24,7 @@
 		"typescript": "^4.1.2"
 	},
 	"scripts": {
-		"dev": "nodemon src/app.ts"
+		"dev": "nodemon src/app.ts",
+		"build": "tsc"
 	}
 }