fix: angular schematic readme update. add check to make sure e2e folder exists to avoid deletion error.

[admah]

User facing changelog

• add check to make sure e2e folder exists to avoid deletion error
• add link to plugins discussion and inspiration in README

Additional details

How has the user experience changed?

PR Tasks

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[cypress]

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Test summary

13841 • 0 • 164 • 5 • 0

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Run details

Project	cypress
Status	Passed
Commit	63dceb9
Started	May 13, 2021 7:31 PM
Ended	May 13, 2021 7:43 PM
Duration	11:27 💡
OS	Linux Debian - 10.8
Browser	Multiple

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