Implement complaint model

[onshimiye]

What Functionality / Service / Endpoint would you like to add?
Database schema model for complaints

Describe this Functionality / Service / Endpoint
A clear and concise description of what you want to add.

Duplicate prevention
It is not being implemented by anyone

Describe how to intend to go about adding this feature
Creating a class with necessary fields for a complaint

Slack username
@onshimiye

Additional context
Add any other context or screenshots about the feature request here.

[cAtaman]

Please properly describe the feature you want to work on