add Google Summer of Code [GSOC] doc page

[CarloLucibello]

cc @Wimmerer

[codecov]

Codecov Report

Merging #117 (8afd660) into master (029f423) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #117   +/-   ##
=======================================
  Coverage   82.97%   82.97%           
=======================================
  Files          15       15           
  Lines        1204     1204           
=======================================
  Hits          999      999           
  Misses        205      205           

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