Flash messages example

[bmwant]

Rationale

We have an issue #25 for message flashing. I'm not sure what will be the final decision on that but we can at least include the snippet to the examples for users to refer when implementing such a feature in their application.

[bmwant]

@asvetlov @jettify do you think we can include this example to the package?

[codecov]

Codecov Report

Merging #270 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #270   +/-   ##
=======================================
  Coverage   95.87%   95.87%           
=======================================
  Files           4        4           
  Lines         194      194           
  Branches       23       23           
=======================================
  Hits          186      186           
  Misses          5        5           
  Partials        3        3

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[asvetlov]

Thanks for the contribution.
I'm on the conference now, will review in a few days.

[bmwant]

@asvetlov I know, listening you talk atm))

[asvetlov]

thanks