docs: add OpenSSF Best Practices registration badge

Author: hyperpolymath

README.adoc

@@ -1,4 +1,6 @@
 = Valence Shell (vsh)
+image:https://img.shields.io/badge/OpenSSF-Best_Practices-green?logo=openssourcesecurity[OpenSSF Best Practices,link="https://www.bestpractices.dev/en/projects/new?repo_url=https://github.com/hyperpolymath/valence-shell"]
+
 
 image:https://img.shields.io/badge/License-MPL--2.0-blue[License: MPL-2.0,link="https://www.mozilla.org/MPL/2.0/"]
 // SPDX-License-Identifier: MPL-2.0