text: const mongoose = require('mongoose');
  
  const Schema = mongoose.Schema;
  
  const userSchema = new Schema({
      username: {
          type: String,
          required: true,
          unique: true,
          trim: true,
          minlength: 3
      },
  }, {
      timestamps: true,
  })
   const User = mongoose.model('User', userSchema);
  
   module.exports = User;