添加README、编译脚本

slader-legacy-backend/.env.example

@@ -0,0 +1 @@
+SL_PORT=9696

slader-legacy-backend/package.json

@@ -4,7 +4,9 @@
   "description": "",
   "main": "src/index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "tsc",
+    "start": "node build/index.js"
   },
   "author": "",
   "license": "ISC",