Create issues for the remaining endpoints

[osioke]

Create issues to mention the remaining endpoints so contributors can easily see what is left to be done.

Check the other issues for the endpoints for guidance on how to create the issues.

The endpoints without issues are:

• Endpoint that returns a single area in the urban region of a state
• Endpoint that returns all the urban streets of a town
• Endpoint that returns a single street in the urban region of a state
• Endpoint that returns a single district in the rural region of a state
• Endpoint that returns a single town in the rural region of a state
• Endpoint that returns a single lga in the rural region of a state
• Endpoint that returns postcode, area_id and all the streets using the postcode

Check the list of endpoints for more information on these endpoints.

P.S. Other useful endpoints not added or defined in the list of endpoints, like #11, can be suggested