Generated .gitignore should include .eslintcache

[jashsayani]

Describe the solution you'd like

The .gitignore generated by create-react-app should include .eslintcache.

[codingpierogi]

See #10161

[cseas]

I believe it's planned to be moved to node_modules which will remove the need for adding it to .gitignore
#9977
cc: @ianschmitz

[zhaodengping]

This file of the .eslintcache is the bundle of the create-script，
but this file, that not been tracked, is about operation of the git
so this problem is about how operation of git ignore this file.
My solution is :
1.delete .eslintcache , and git add . git push this commit ;
2.then run your project in command line , you'll not see this file been tracked;

Good luck!😊