Add CHANGELOG

CHANGELOG.md

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+# [unreleased](https://github.com/tingerrr/hydra/releases/tags/)
+## Added
+
+## Removed
+
+## Changed
+
+---
+
+# [v0.4.0](https://github.com/tingerrr/hydra/releases/tags/v0.4.0)
+Almost all changes in this release are **BREAKING CHANGES**.
+
+## Added
+- internal util functions and dictionaries for recreating `auto` fallbacks used within the typst
+  compiler
+  - `core.get-text-dir` - returns the text direction
+  - `core.get-binding` - returns the page binding
+  - `core.get-page-size` - returns the page size
+  - `core.get-top-margin` - returns the absolute top margin
+  - `util.text-direction` - returns the text direction for a given language
+
+## Removed
+- various parameters on `hydra` have been removed
+  - `binding` has been removed in favor of get rule
+  - `dir` has been removed in favor of get rule
+  - `paper` has been removed in favor of get rule
+  - `page-size` has been removed in favor of get rule
+  - `top-margin` has been removed in favor of get rule
+  - `loc` has been removed in favor of user provided context
+
+## Changed
+- hydra now requires a minimum Typst compiler version of `0.11.0`
+- `hydra` is now contextual
+- most internal functions are now contextual
+- the internal context dictionary now holds a `anchor-loc` instead of a `loc`
+- `get-anchor-pos` has been renamed to `locate-last-anchor`
+- the internal `page-sizes` dictionary was changed to function
+
+---
+
+# [v0.3.0](https://github.com/tingerrr/hydra/releases/tags/v0.3.0)
+
+# [v0.2.0](https://github.com/tingerrr/hydra/releases/tags/v0.2.0)
+
+# [v0.1.0](https://github.com/tingerrr/hydra/releases/tags/v0.1.0)