updated Python examples to explain latest syntax

[ContrastingSounds]

It was a bit confusing having both syntaxes in the code examples (sdk = client.setup(), sdk = looker_sdk.init31(). The older examples still have value, so put them into a folder and updated README. Also, added a run_line_query example..

[joeldodge79]

@ContrastingSounds sorry this slipped of my radar. I think we updated the examples to just reflect the latest method of client instantiation. But I see you added an example here for run_inline_query. I'd be happy to get that in if you want to re-submit it (either rebase this PR or just close it and open a new one with that example)