feat(api-mock): add package.json for api

api/package.json

+{
+  "name": "pamn-mock-api",
+  "version": "0.0.0",
+  "scripts": {
+    "api": "json-server api/db.json --routes api/routes.json --no-cors=true"
+  },
+  "private": true,
+  "dependencies": {
+    "json-server": "^0.16.2",
+  },
+}