Tour Manager: Define models and create the initial migration

[GevorgMartirosyan]

Each Tour should have these fields:

• Name
• Description
• Type
• Duration
• Start Date
• End Date
• Collection of Clients
• Dictionary of Bookings by groups // For example in the city A we can have initial bookings X,Y,Z.
• Price

Each Package should have these fields:

• Name
• Description
• Type
• Duration
• Dictionary of Bookings by groups // For example in the city A we can have initial bookings X,Y,Z.
• Price