✨ Add create and retrieve methods for Source entry

[esemi]

No description provided.

[jsbronder]

A few notes:

• This needs an addition of a class Source so that convert_json_response and create_json_request can do their serialization tasks.
• Unittests ;)
• I'd leave out the close method. The intent of the class is that it will borrow a session, not own one. The caller should be closing when appropriate.

[esemi]

• Added tests
• Remove close method
• Add Source class
• Add version param for Client

[esemi]

Hey guy, was up ?)

[jsbronder]

It'll be a little bit for me to get to this, my wife gave birth to our son earlier this week :)

[esemi]

Congratulations! =)