Update README.md

Signed-off-by: Nikolay Dubina <[email protected]>

README.md

@@ -4,6 +4,7 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/nikolaydubina/htmljson)](https://goreportcard.com/report/github.com/nikolaydubina/htmljson)
 [![Go Reference](https://pkg.go.dev/badge/github.com/nikolaydubina/htmljson.svg)](https://pkg.go.dev/github.com/nikolaydubina/htmljson)
 [![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/nikolaydubina/htmljson/badge)](https://securityscorecards.dev/viewer/?uri=github.com/nikolaydubina/htmljson)
 
 * pure Go
 * no Javascript