Add a changelog (#237)

Author: edwardhorsford

CHANGELOG.md

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+# NHS.UK React components
+
+## Unreleased
+
+:wrench: **Fixes**
+
+* Add js shims for buttons. PR #231, Fixes #218
+* Fix errors not being linked to inputs. PR #230, Fixes #227
+* Fix inputs incorrectly using `aria-labelledby`. PR #230, Fixes #212
+* Update Storybook docs for several components.
+
+:new: **New features**
+
+* Added a CHANGELOG to keep track of changes between releases. [Keep a changelog](https://keepachangelog.com)
+* Added support for `preventDoubleClick` debouncing on buttons. PR #231
+* Error summaries now automatically set role, tabindex, and aria-labelledby. PR #229, Fixes #228
+* Storybook link in readme now points to latest version. PR #226
+
+## 4.0.2 - 21 May 2024
+
+:wrench: **Fixes**
+
+*-* Fix error message role by @edwardhorsford in #219
+
+## 4.0.1 - 20 May 2024
+
+:wrench: **Fixes**
+
+* Fix issue with the footer copyright not being rendered in the correct location if there are multiple link columns by @jakeb-nhs in #223
+
+## 4.0.0 - 15 May 2024
+
+This version updates nhsuk-frontend to version 8.
+
+For a full list of changes in this release please refer to the [migration doc](https://github.com/NHSDigital/nhsuk-react-components/blob/feature/nhsuk-frontend-v8/docs/upgrade-to-4.0.md).
+
+* Migrate enzyme to react-testing-library by @JoshuaBates-NHS in #198
+* Allow support for module directives in build process by @JoshuaBates-NHS in #199
+* Update modified components since NHS UK frontend v5 by @jakeb-nhs in #197
+* Add new components since NHS UK frontend v5 by @jakeb-nhs in #202
+* Migrate some patterns to components, rework removed components from frontend v8 by @jakeb-nhs in #203
+* Improve unit test coverage by @jakeb-nhs in #204