Add Zenodo badges to documentation

[tsalo]

Closes #31.

Changes proposed:

• Add Zenodo badges to README and docs/index.rst.
• Add myself to the Zenodo file.

[codecov-commenter]

Codecov Report

Merging #71 (8a419ad) into master (2858c48) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   88.61%   88.61%           
=======================================
  Files          10       10           
  Lines         773      773           
=======================================
  Hits          685      685           
  Misses         88       88           

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