DOC contributing.MD file for PyMVPA

[chrispycheng]

WORK IN PROGRESS! I'm learning.

[yarikoptic]

the hierarchy seems needs review/tune up to match pymvpa one

[coveralls]

Changes Unknown when pulling abbc324 on chrispycheng:doc-contributing into ** on PyMVPA:master**.

[codecov-io]

Codecov Report

Merging #536 into master will decrease coverage by 0.95%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #536      +/-   ##
=========================================
- Coverage   76.66%   75.7%   -0.96%     
=========================================
  Files         364     364              
  Lines       41347   41434      +87     
  Branches     6668    6681      +13     
=========================================
- Hits        31697   31366     -331     
- Misses       7755    8211     +456     
+ Partials     1895    1857      -38

Impacted Files	Coverage Δ
mvpa2/tests/test_svmkernels.py	5.94% <0%> (-94.06%)	⬇️
mvpa2/tests/test_lars.py	10% <0%> (-83.34%)	⬇️
mvpa2/clfs/sg/sens.py	20% <0%> (-66.16%)	⬇️
mvpa2/clfs/lars.py	29.06% <0%> (-58.14%)	⬇️
mvpa2/support/scipy/signal.py	11.36% <0%> (-47.73%)	⬇️
mvpa2/clfs/sg/svm.py	15.71% <0%> (-45.36%)	⬇️
mvpa2/kernels/sg.py	47% <0%> (-44%)	⬇️
mvpa2/tests/test_kernel.py	62.02% <0%> (-34.82%)	⬇️
mvpa2/clfs/svm.py	65.38% <0%> (-11.54%)	⬇️
mvpa2/clfs/warehouse.py	69.72% <0%> (-10.56%)	⬇️
... and 55 more

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