Added a basic changelog. Will need to setup release automation

Author: gilest

CHANGELOG.md

@@ -0,0 +1,12 @@
+# Changelog
+
+## 0.4.0 (2025-01-16)
+
+### Breaking
+- Adds a struct for the `PhoenixImportmap.Importmap` module that implements the `Phoenix.HTML.Safe` protocol. This change is a breaking change if you currently use `raw` to
+interpolate the importmap into the template.
+
+## 0.3.0 (2025-01-09)
+
+### Breaking
+- Use a reference to consuming projects' Endpoint module to generate digested asset paths in production.