Services model added

[singhayushh]

Fixes #99

Changes done

• [x] Service Model created - the hotel staff can create some services which the user can reference and request services
• [x] Live Service Model created - It stores the live requests by the customers of the hotel so that the hotel staff can easily track requests on basis of user / room number as well as assign services to their employees.

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[singhayushh]

I think the service schema name should be enum type like it should be chosen from a predefined list what you say

There are two models under this

• Service Model: this is used to create the predefined list you mentioned. When the application goes live, the admin will have to add the services he offers in his restaurant. So let's say that after creation by the admin, predefined list is ['Laundry Service', 'Room Service', 'Bar Service']
• Live Service: Now the customers - whenever they would want to request a service, will have the above predefined list that the hotel admin created. Live Service documents will hold reference to the customer and the service which confirms that the values can only be existing database entries for services and customers.

Enum is just object of strings and if we use that, we will have to manually write all the services but if we use the above system, the admin will be able to add to the predefined list on his own and the same will be reflected in available services for the customers.