Add usage examples and development status information

[smkent]

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[codecov-commenter]

Codecov Report

Merging #13 (56bc661) into master (dc4afe9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files          20       20           
  Lines         498      498           
=======================================
  Hits          475      475           
  Misses         23       23           

Impacted Files	Coverage Δ
jmapc/methods/base.py	94.73% <100.00%> (ø)

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