Add easyecc (simple API for common Elliptic Curve Cryptography operations)

[regnull]

Please check if what you want to add to awesome-go list meets quality standards before sending pull request. Thanks!

Please provide package links to:

• repo link (github.com, gitlab.com, etc): https://github.com/regnull/easyecc
• pkg.go.dev: https://pkg.go.dev/github.com/regnull/easyecc
• goreportcard.com: https://goreportcard.com/report/github.com/regnull/easyecc
• coverage service link (codecov, coveralls, etc.): https://coveralls.io/github/regnull/easyecc

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• The package has been added to the list in alphabetical order.
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• The repo documentation has a pkg.go.dev link.
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