user login model added

+const mongoose = require('mongoose');
+const userSchema = mongoose.Schema({
+    name : {
+        type : String,
+        maxlength : 50
+    },
+    email :{
+        type : String,
+        trim : true, // trim은 이메일 주소 받을때 공백을 없애준다.
+        unique : 1 // 중복 허용 안함
+    },
+    password :{
+        type : String,
+        minlength : 50
+    },
+    lastname:{
+        type : String,
+        maxlength : 50
+    },
+    role:{
+        type : Number, // 1 : admin, 0 : common user
+        default : 0
+    },
+    image: String,
+    token: {
+        type : String
+    },
+    tokenExp :{
+        type: Number,
+    }
+
+})
+
+const User = mongoose.model('User', userSchema)
+
+
+
+model.exports = {}
+