docs: add OpenSSF Best Practices registration badge

Author: hyperpolymath

README.adoc

@@ -1,5 +1,10 @@
-= wordpress-tools
 // SPDX-License-Identifier: MPL-2.0
+// Copyright (c) Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
+= wordpress-tools
+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/wordpress-tools"]
+
+image:https://img.shields.io/badge/License-MPL_2.0-blue.svg[License: MPL-2.0,link="https://opensource.org/licenses/MPL-2.0"]
+
 :author: Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 
 WordPress security, plugin management, and theming tools.
@@ -14,7 +19,9 @@ WordPress security, plugin management, and theming tools.
 
 == License
 
-MPL-2.0
+This project is licensed under the Mozilla Public License, v. 2.0. See the `LICENSE` file for details.
+
+SPDX-License-Identifier: MPL-2.0
 
 
 == Architecture