Added support for retrieving the profile information

[BuilderJG]

in order to access the full possibilities of the Spond API, I added the function get_profile() returning a JSONDict containing information belonging to the account logged in, e.g.:

• the accounts' id
• first- and last name
• email
• country code
• global notification settings
• date of birth
• etc.

first time contributor, so I'm open to feedback c:

[elliot-100]

Looks good to me; have tried it out with an amended version of the script in examples/manual_test_functions.py - it would be nice to merge that in from https://github.com/elliot-100/Spond/tree/get_profile

[elliot-100]

I'll merge that script in separately. Forgot to say many thanks for the contribution @BuilderJG !