[Feature] Add config and README for GLEAN

[ckkelvinchan]

Currently include GLEAN for

1. human face 16x SR
2. cat 16x SR

[codecov]

Codecov Report

Merging #332 (a8b3c35) into master (f0b2ab4) will not change coverage.
The diff coverage is n/a.

❗ Current head a8b3c35 differs from pull request most recent head 882f80e. Consider uploading reports for the commit 882f80e to get more accurate results

@@           Coverage Diff           @@
##           master     #332   +/-   ##
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  Coverage   80.30%   80.30%           
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  Files         177      177           
  Lines        9280     9280           
  Branches     1352     1352           
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  Hits         7452     7452           
  Misses       1640     1640           
  Partials      188      188           

Flag	Coverage Δ
unittests	80.28% <ø> (ø)

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[innerlee]

Also add it to the repo's README

[ckkelvinchan]

Also add it to the repo's README

Okay done~