Added env specimen files and start scripts

package.json

@@ -5,10 +5,9 @@
     "main": "./src/main.ts",
     "private": true,
     "scripts": {
-        "dev": "nodemon",
         "build": "tsc -p ./",
-        "start": "ts-node ./src/main.ts",
-        "start:prod": "node ./dist/main.js"
+        "start:dev": "set NODE_ENV=dev && ts-node ./src/main.ts",
+        "start:prod": "set NODE_ENV=prod && npm run build && node ./dist/main.js"
     },
     "repository": {
         "type": "git",
@@ -59,4 +58,4 @@
         "ts-node": "^10.1.0",
         "typescript": "^4.3.5"
     }
-}
+}