feat: VideoModel 스키마 추가

 var mongoose = require('mongoose');
 var Schema = mongoose.Schema;
 var VideoSchema = new Schema({
-  username: {
-    type: String,
-    required: [true, '아이디는 필수입니다.'],
-  },
-  password: {
-    type: String,
-    required: [true, '패스워드는 필수입니다.'],
-  },
-  displayname: String,
-  created_at: {
-    type: Date,
-    default: Date.now(),
-  },
+  categori: String,
+  id: Number,
+  title: String,
+  video_id: String,
+  urls: String,
 });
 
 module.exports = mongoose.model('videos', VideoSchema);