Add warnings for edge and beta versions in README template

Author: jeppestaerk

.README.j2

@@ -2,6 +2,48 @@
 
 [![License][license-shield]][license]
 
+{% if channel == "edge" %}
+## WARNING! THIS IS AN EDGE VERSION!
+
+> [!CAUTION]
+> This Home Assistant Add-ons repository contains edge builds of add-ons.
+> Edge builds add-ons are based upon the latest development version.
+
+- They may not work at all.
+- They might stop working at any time.
+- They could have a negative impact on your system.
+
+This repository was created for:
+
+- Anybody willing to test.
+- Anybody interested in trying out upcoming add-ons or add-on features.
+- Developers.
+
+If you are more interested in stable releases of our add-ons:
+
+<https://github.com/staerk-ha-addons/repository>
+
+{% endif %}
+{% if channel == "beta" %}
+## WARNING! THIS IS A BETA VERSION!
+
+> [!WARNING]
+> This Home Assistant Add-ons repository contains beta releases of add-ons.
+
+- They might stop working at any time.
+- They could have a negative impact on your system.
+
+This repository was created for:
+
+- Anybody willing to test.
+- Anybody interested in trying out upcoming add-ons or add-on features.
+
+If you are more interested in stable releases of our add-ons:
+
+<https://github.com/staerk-ha-addons/repository>
+
+{% endif %}
+
 ## About
 
 Home Assistant add-ons repository by Jeppe Stærk. These add-ons extend the functionality of your Home Assistant installation.
@@ -70,5 +112,7 @@ MIT License - Copyright (c) 2025 Jeppe Stærk
 {% endif %}
 {% endfor %}
 {% endfor %}
+[frenck]: https://github.com/frenck
+[ha-addons]: https://addons.community/
 [license]: https://github.com/staerk-ha-addons/repository/blob/main/LICENSE
 [license-shield]: https://img.shields.io/github/license/staerk-ha-addons/repository.svg