installation link to readme

[matti]

No description provided.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

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[matti]

I signed it!

[googlebot]

CLAs look good, thanks!

[codecov-io]

Codecov Report

Merging #1437 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1437   +/-   ##
=======================================
  Coverage   44.53%   44.53%           
=======================================
  Files         112      112           
  Lines        4596     4596           
=======================================
  Hits         2047     2047           
  Misses       2342     2342           
  Partials      207      207

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