SWIFT-423 Provide transactions guide for docs

[JamesHeppenstall]

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[codecov-io]

Codecov Report

Merging #444 into master will not change coverage by %.
The diff coverage is n/a.

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  Files         116      116           
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  Hits         9770     9770           
  Misses       3029     3029           

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[kmahar]

my bad for not pointing this out before, but we have all of the official docs examples live in the project located at Examples/DocsExamples, so it would be great if we could have the code in there as well. that makes it easy for us to ensure our example code still builds in the future.

that said I think it's a good idea to have a guide in our docs on transaction use too so let's keep the markdown file, and we can expand it with convenient API examples later on.

[JamesHeppenstall]

Note that the tests to compile the examples will fail until SWIFT-752 is pushed to master. This is because you must currently specify the label options in startTransaction().