Add changelog entry for v2.0.0

Signed-off-by: Stefan Prodan <[email protected]>

Author: stefanprodan

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+## 2.0.0
+
+**Release date:** 2025-09-15
+
+This major release marks the addition of source-watcher to the [Flux](https://fluxcd.io) controller suite.
+
+### ArtifactGenerator
+
+The [ArtifactGenerator](docs/spec/v1beta1/artifactgenerators.md) is an extension of Flux APIs
+that allows source composition and decomposition.
+
+The `ArtifactGenerator` API is currently in `v1beta1` and can be used in production
+environments running Flux v2.7 and later with kustomize-controller and helm-controller
+configured with `--feature-gates=ExternalArtifact`.
+
+Improvements:
+- Introduce ArtifactGenerator API
+  [#255](https://github.com/fluxcd/source-watcher/pull/255)
+- Conform with GitOps Toolkit standards
+  [#257](https://github.com/fluxcd/source-watcher/pull/257)
+- Prepare for v2 release
+  [#258](https://github.com/fluxcd/source-watcher/pull/258)
+- Update source-controller API to v1.7.0
+  [#261](https://github.com/fluxcd/source-watcher/pull/261)