Update readme

[shinich1]

We need to clarify the relationship with graphix, emphasizing the complementary nature of the two. We also need to invite maintainers of graphix into this discussion, to facilitate collaboration/coordination, now that the package structure is clarified by merging of several PRs in recent weeks.

@masa10-f

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.58%. Comparing base (686366a) to head (7d5ec38).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   67.58%   67.58%           
=======================================
  Files          21       21           
  Lines        1968     1968           
  Branches      300      300           
=======================================
  Hits         1330     1330           
  Misses        590      590           
  Partials       48       48           

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[masa10-f]

Thank you for your update. Looks good to me.