Add changelog.md

Author: nehadereddy

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.2]
+- Fixed video_source_bitrate in variantChanged events.
+- Fixed event transition calculations .
+
+## [1.0.1]
+- Bug fixes and maintenance updates.
+
+## [1.0.0]
+
+### Added
+  - Enabled video performance tracking using FastPix Data SDK, supporting user engagement metrics, playback quality monitoring, and real-time streaming diagnostics.
+  - Provides robust error management and reporting capabilities for video performance tracking.
+  - Includes support for custom metadata, enabling users to pass optional fields such as `video_id`, `video_title`, `video_duration`, and more.
+  - Introduced event tracking for `videoChange` to handle metadata updates during playback transitions.