added access-token.js to models folder and moved mailer.js to the routes folder
moved mailer.js back to models folder
Updated employee model and route
    * added auto populate aka pseudo join
Fixed employee model and route issues
Fixed api by changing _id to id
Fixed issue about Data not being saved when updating the Employee record
Added user-login routes for getting access token and also renamed resetPassword routes to reset-password
added mailer to assign notification
Refactor sendmail login when assigning an employee to a specific asset
Fixed mailer issue when assigning an employee to an asset/item
Fixed duplicating assigned items
Fixed access-token duplicate issue
added access control for access_token
Excluded user-login routes from all the access_token required routes
Updated error message when access_token is invalid
updated error_message
added reset-password routes to excluded routes from access_token
Added select: false on the password field to exclude password employee data
move resetPassword to index.js