docs(readme): mention other supported formats

Author: thomasleplus

README.md

@@ -58,6 +58,14 @@ To know more command-line options of `yamllint`:
 docker run --rm --net=none leplusorg/yaml yamllint -h
 ```
 
+## Other formats
+
+Note that many tools included in this image can also handle other
+popular formats like:
+- TOML (e.g. v8r, prettier, dasel, yq, remarshal)
+- Java .properties files (e.g. yq)
+- Microsoft Windows INI files (e.g. yq)
+
 ## Software Bill of Materials (SBOM)
 
 To get the SBOM for the latest image (in SPDX JSON format), use the