Add publiccode.yml page (#56)

Author: bfabio

content/crosswalk/publiccode.md

@@ -0,0 +1,10 @@
+---
+title: "Crosswalk for publiccode.yml"
+image: "/img/publiccode.png"
+date: "2025-08-10"
+
+---
+
+The [publiccode.yml](https://github.com/publiccodeyml/publiccode.yml) spec defines metadata for public sector OSS software projects, used by national and international catalogs to index, present, and facilitate the reuse of open source software developed by or for public administrations.
+
+{{< crosswalk name="publiccode.yml spec" >}}