Add CHANGELOG.md for version 4.0.0 release

Author: manu4543

CHANGELOG.md

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+## 4.0.0
+
+This is a major release that includes breaking changes. Please refer to the [official documentation](https://imagekit.io/docs/integration/vuejs) for up-to-date usage instructions.
+
+## 3.1.0
+
+- Added `checks` parameter by [@ankur-dwivedi](https://github.com/ankur-dwivedi) in [#115](https://github.com/imagekit-developer/imagekit-vuejs/pull/115).
+
+**Full Changelog**: [v3.0.1...v3.1.0](https://github.com/imagekit-developer/imagekit-vuejs/compare/3.0.1...3.1.0)
+
+---
+
+## 3.0.1
+
+- Fixed issue [#113](https://github.com/imagekit-developer/imagekit-vuejs/issues/113).
+
+**Full Changelog**: [v3.0.0...v3.0.1](https://github.com/imagekit-developer/imagekit-vuejs/compare/3.0.0...3.0.1)
+
+---
+
+## 3.0.0
+
+- Added support for the `transformation` parameter to apply both **pre-** and **post-** transformations during upload.  
+- Introduced new parameters: `effectShadow` and `effectGradient`.  
+- **Breaking Change:** Removed legacy overlay syntax parameters such as `oi`, `ot`, `obg`, etc.
+
+**Full Changelog**: [v2.0.1...v3.0.0](https://github.com/imagekit-developer/imagekit-vuejs/compare/2.0.1...3.0.0)
+
+---
+
+## 2.0.1
+
+- **Vue 3 support:** The SDK now works seamlessly with Vue 3 applications.  
+- Added video-playback capability.  
+- Resolved community-reported issues [#33](https://github.com/imagekit-developer/imagekit-vuejs/issues/33), [#34](https://github.com/imagekit-developer/imagekit-vuejs/issues/34), [#42](https://github.com/imagekit-developer/imagekit-vuejs/issues/42), [#44](https://github.com/imagekit-developer/imagekit-vuejs/issues/44), [#47](https://github.com/imagekit-developer/imagekit-vuejs/issues/47), [#49](https://github.com/imagekit-developer/imagekit-vuejs/issues/49) and [#50](https://github.com/imagekit-developer/imagekit-vuejs/issues/50).
+
+**Full Changelog**: [v2.0.0...v2.0.1](https://github.com/imagekit-developer/imagekit-vuejs/compare/2.0.0...2.0.1)
+
+---
+
+## 2.0.0
+
+- **Deprecated release.** This version is marked **“DO NOT USE.”**
+
+**Full Changelog**: [v1.0.9...v2.0.0](https://github.com/imagekit-developer/imagekit-vuejs/compare/1.0.9...2.0.0)
+
+---
+
+For the complete list of releases and changes, visit the [GitHub Releases Page](https://github.com/imagekit-developer/imagekit-vuejs/releases).