docs: add component ownership and licenses

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>

Author: gbartolini

templates/README.md.tmpl

@@ -76,3 +76,33 @@ Once the database is ready, connect to it with `psql` and run:
 ```
 
 You should see `{{ .Name }}` listed among the installed extensions.
+
+## Contributors
+
+This extension is maintained by:
+
+- FirstName LastName (@GitHub_Handle)
+
+The maintainers are responsible for:
+
+- Monitoring upstream releases and security vulnerabilities.
+- Ensuring compatibility with supported PostgreSQL versions.
+- Reviewing and merging contributions specific to this extension's container
+  image and lifecycle.
+
+---
+
+## Licenses and Copyright
+
+This container image contains software that may be licensed under various
+open-source licenses.
+
+All relevant license and copyright information for the `{{ .Name }}` extension
+and its dependencies are bundled within the image at:
+
+```text
+/licenses/
+```
+
+By using this image, you agree to comply with the terms of the licenses
+contained therein.