Merge branch 'main' of https://github.com/json-structure/core

Author: clemensv

.gitignore

@@ -9,6 +9,7 @@
 /*-[0-9][0-9].xml
 /.*.mk
 /.gems/
+/.idea/
 /.refcache
 /.venv/
 /.vscode/

CONTRIBUTING.md

@@ -20,7 +20,7 @@ subject to a Simplified BSD License) in Contributions.
 ## Working Group Information
 
 Discussion of this work occurs on the [JavaScript Object Notation
- mailing list](mailto:json@ietf.org)
+Working Group mailing list](mailto:json@ietf.org)
 ([archive](https://mailarchive.ietf.org/arch/browse/json),
 [subscribe](https://www.ietf.org/mailman/listinfo/json)).
 In addition to contributions in GitHub, you are encouraged to participate in
@@ -30,4 +30,4 @@ discussions there.
 technical issues needs to occur on the mailing list.
 
 You might also like to familiarize yourself with other
-[ documents](https://datatracker.ietf.org/wg/json/documents/).
+[Working Group documents](https://datatracker.ietf.org/wg/json/documents/).