[Comparisons] Generated reports comparing the unhinted static ttfs against the official v2.138 unhinted ttfs

Docs/Compare/master_ttf_vs_v2_138/README.md

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+# [v2.138 unhinted offical](https://github.com/google/roboto/releases/tag/v2.138) vs master_ttf
+
+Regression tests to determine whether the .ufos in master_ufo/ produce acceptable static fonts.
+
+
+## Building ttfs
+
+master_ttf/ built with [fontmake v1.6.0](https://github.com/googlei18n/fontmake/releases/tag/v1.6.0) using the following cli:
+
+```
+FONTS=$(ls -d ./master_ufo/*.ufo/)
+for f in $FONTS
+do
+  fontmake -u $f -o ttf --no-production-names
+done;
+```
+
+## Generating diffs
+
+Diffs produced with [fontdiffenator](https://github.com/googlefonts/fontdiffenator) and [diffbrowsers](https://github.com/googlefonts/diffbrowsers)
+
+## Summary for commit e7ece644e5714951089cd6916db07fc055c9383d
+- No marks are missing
+- mark below for uni1E2C fixed
+- Some mkmks are missing but no visual difference
+- Some mkmks are modified but no visual difference
+- No kerns are missing
+- No glyphs are missing
+- caretSlopeRun, caretSlopeRise in italics are different
+- Modified glyphs: Some distortions, are they acceptable? more distortions are occuring in the italic and condensed styles
+
+
+## Diff Notes
+
+Following summary has been made by M Foley by reviewing each diff image
+
+### Modified Glyphs
+- uni015E which looks like a 'K' now features a double story construction. Fixes https://github.com/google/roboto/issues/289
+- sampi, uni0236, uni030F, uni1AB5 have the most notable distortions. Other glyphs seem fine
+
+Roboto-LightItalic/glyphs_modified/gifs/Desktop_Windows_7_ie_9.0_.gif
+
+### Modified Marks
+- Changes only uni1E2C