docs: moar badge

Author: mhx

README.md

@@ -4,6 +4,7 @@
 [![Build Status](https://app.travis-ci.com/mhx/dwarfs.svg?branch=main)](https://app.travis-ci.com/github/mhx/dwarfs)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/53489f77755248c999e380500267e889)](https://app.codacy.com/gh/mhx/dwarfs/dashboard)
 [![codecov](https://codecov.io/github/mhx/dwarfs/graph/badge.svg?token=BKR4A3XKA9)](https://codecov.io/github/mhx/dwarfs)
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/8663/badge)](https://www.bestpractices.dev/projects/8663)
 
 # DwarFS