Add examples to docs

[NikitaKishore]

@Nosferican I have added a few examples and am working on a few more.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@0f5275e). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #241   +/-   ##
=========================================
  Coverage          ?   58.73%           
=========================================
  Files             ?       25           
  Lines             ?     1786           
  Branches          ?        0           
=========================================
  Hits              ?     1049           
  Misses            ?      737           
  Partials          ?        0

Impacted Files	Coverage Δ
src/arma.jl	80.55% <ø> (ø)
src/markov/mc_tools.jl	78.49% <ø> (ø)
src/zeros.jl	42.37% <ø> (ø)
src/modeltools/utility.jl	94.44% <ø> (ø)

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[sglyon]

Thank you for working on this. More examples would be great!

Please let us know when this is ready for a review.

[NikitaKishore]

I have added a few more examples. Please review them.