Several fixes and new routes added

[MRVDH]

• Added 2fa generate and verify endpoints based on the information by @nielstenboom #10.
• Added user info and profile menu endpoints.
• Added payment profile and wallet transactions endpoints.
• Added customer service contact info and parcels endpoints.
• Added CONTRIBUTING guide and updated the README.
• Fixed the search based on the solution of @christof-mathies #13.
• Fixed the QuantityDecorator not being exported #11.
• Updated several existing routes with missing response body properties.
• Removed the routes endpoint.