Add bash examples to repository

[bethesque]

Copy from: https://gist.github.com/bethesque/9d81f21d6f77650811f4

[YOU54F]

I believe this is partially done

we have the single interaction example from the gist, albeit with minor changes.

https://github.com/pact-foundation/pact-mock_service/tree/master/script

so just wants these two example types moving across

• 3-multiple-interactions-at-same-time.sh
• 3-multiple-interactions.sh

[bethesque]

I'm not really sure why I wanted those. Maybe it was to show wrapper library implementers how to use the mock service. I think we should just close this.