Add docs for CLI Options with tests

[tiangolo]

📝 ✨ Add docs for CLI Options with tests.

[codecov-io]

Codecov Report

Merging #12 into master will increase coverage by 6.37%.
The diff coverage is 98.9%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   72.94%   79.32%   +6.37%     
==========================================
  Files          17       29      +12     
  Lines         621      798     +177     
==========================================
+ Hits          453      633     +180     
+ Misses        168      165       -3

Impacted Files	Coverage Δ
typer/main.py	49.51% <ø> (+0.63%)	⬆️
typer/models.py	99% <ø> (+0.95%)	⬆️
typer/completion.py	66.66% <0%> (-3.34%)	⬇️
docs/src/options/tutorial002.py	100% <100%> (ø)
docs/src/options/tutorial004.py	100% <100%> (ø)
...sts/test_tutorial/test_options/test_tutorial005.py	100% <100%> (ø)
...sts/test_tutorial/test_options/test_tutorial004.py	100% <100%> (ø)
docs/src/options/tutorial003.py	100% <100%> (ø)
docs/src/options/tutorial006.py	100% <100%> (ø)
docs/src/options/tutorial001.py	100% <100%> (ø)
... and 18 more

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