retroactively adds changelog

CHANGELOG.md

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+# Apium Changelog
+
+All notable changes to Apium will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic
+Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- Template - Please preserve this order of sections
+## [Unreleased] - Brief description
+[Unreleased]: https://github.com/CDRH/api/compare/v#.#.#...dev
+
+### Fixed
+
+### Added
+
+### Changed
+
+### Removed
+
+### Migration
+
+### Deprecated
+
+### Contributors
+-->
+
+## [Unreleased]
+
+### Fixed
+
+### Added
+
+### Changed
+
+### Migration
+
+## [v1.0.2](https://github.com/CDRH/api/compare/v1.0.1...v1.0.2) - escapes and sorting
+
+### Fixed
+- question mark and asterisk behavior in queries
+- order of expected, actual in tests
+- sort behavior for relevancy
+
+### Added
+- support for multivalued and nested field sorting
+- documentation moved back into apium from henbit location in order to version it with software
+
+### Changed
+- ruby, rails, and other gem versions
+
+## [v1.0.1](https://github.com/CDRH/api/compare/v1.00...v1.0.1) - version 1.0.1
+
+### Changed
+- ruby, rails, and other gem versions
+- version moved to initializer
+
+## [v1.0.0](https://github.com/CDRH/api/tree/v1.0.0) - Initial Launch