Add CHANGELOG documenting the incremental build fix

Author: nataphonk

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.8.7-alpha] - 2024-08-14
+
+### Fixed
+- **Critical Build Performance Issue**: Fixed incremental build caching that was broken in previous versions
+  - Removed `task.outputs.upToDateWhen { false }` logic that forced recompilation on every build
+  - This particularly affected the `compileTestKotlin` task, causing it to always recompile
+  - Build performance improvement: Tasks now properly marked as `UP-TO-DATE` on subsequent builds
+  - Significantly reduces build times for projects using the inspektor plugin
+
+### Changed
+- Simplified compilation task configuration to not interfere with Gradle's caching mechanism
+- Improved directory creation logic to work without breaking incremental builds
+
+## [0.8.6-alpha] - Previous version
+
+- Initial alpha release with OpenAPI generation support