add changelog

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased] - yyyy-mm-dd
+
+### Added
+
+### Changed
+
+
+## [Unreleased] - 2024-03-18
+
+### Added
+- Tests queries (injective cosmoswasm mock) covering functionality of querier.rs 
+
+### Fixed
+ - Exchange aggregate volume query to use the correct parsing. 
+
+### Removed
+- Grants related queries. 
+- Exchange denom decimal query.