change context to accounts and add roles table

[GettyOrawo]

Done

Change context from User to Accounts to avoid redundancy since there's already a module called User.
Create a form with functionality for creating a role.

• Roles should not be blank
• Roles should be unique
  Context tests for the above functionality

To be done

• Every created user should belong to a role.
• A role can have many users.

[sigu]

Great one, opening an issue to resolve my comment. Should not be done on this PR

[GettyOrawo]

This merge request has been opened in another branch. closing... #109