Add Example reactorkit-keyboard-example

[techinpark]

reactorkit-keyboard-example iOS Application example for develop keyboard-extensions ⌨️
This project is implemented with Reactorkit architecture and RxSwift.

[codecov]

Codecov Report

Merging #144 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   94.40%   94.40%           
=======================================
  Files           8        8           
  Lines         143      143           
=======================================
  Hits          135      135           
  Misses          8        8           

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[devxoul]

👍💯