Add example of setting session vars with a session, engine, and conne…

[huntcsg]

…ction

[codecov-io]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   34.41%   34.41%           
=======================================
  Files           9        9           
  Lines         154      154           
  Branches       23       23           
=======================================
  Hits           53       53           
  Misses        100      100           
  Partials        1        1

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