Add CHANGELOG.md

Author: nilmerg

CHANGELOG.md

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+# Icinga Notifications Web Changelog
+
+Please make sure to always read our [Upgrading](https://icinga.com/docs/icinga-notifications-web/latest/doc/05-Upgrading/)
+documentation before switching to a new version.
+
+## 0.2.0 (2025-11-19)
+
+With Icinga Notifications 0.2.0 we changed how event rule filters are configured and processed.
+Sources are now responsible for deciding which event rules apply to a given event. In the case
+of Icinga 2, this allows associating event rules with custom variables, for example. Please
+make sure to upgrade Icinga DB to 1.5.0 and Icinga DB Web to 1.3.0 to facilitate this change.
+
+## Additional Features
+
+Some of you asked for this in the past, and now Icinga Notifications Web provides a way to configure
+contacts and contact groups using a REST API! But that's not all, the API is also thoroughly documented
+using the OpenAPI standard to make it easy to integrate with other tools. Make sure to check it out:
+https://icinga.com/docs/icinga-notifications-web/latest/doc/20-REST-API/
+
+The schedule configuration got also a highly expected enhancement: Timezone support!
+You can now configure a schedule to use a specific timezone other than the local timezone.
+When viewing a schedule, you can temporarily switch to any other timezone, allowing you to
+easily verify availability even if abroad.
+
+### Fixes and Enhancements
+
+A few months ago, we performed several user testing sessions, and this release includes the changes
+suggested during those sessions. Expect to see various small improvements and better user experience.
+The schedule configuration in particular has been improved in many ways.
+
+## 0.1.0 (2024-07-24)
+
+Initial release