[doc] Add entry page for the library documentation

[vkarak]

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[codecov-commenter]

Codecov Report

Merging #2244 (731b7fe) into master (7b1635c) will not change coverage.
The diff coverage is n/a.

❗ Current head 731b7fe differs from pull request most recent head 809d47d. Consider uploading reports for the commit 809d47d to get more accurate results

@@           Coverage Diff           @@
##           master    #2244   +/-   ##
=======================================
  Coverage   85.54%   85.54%           
=======================================
  Files          55       55           
  Lines        9754     9754           
=======================================
  Hits         8344     8344           
  Misses       1410     1410           

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