Add changelog

CHANGELOG.md

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+cl-# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog],
+and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+
+### Added
+
+- Regex to parse version string from a larger string, and allowing for optional path number
+- Parse function that takes a string and returns a semver.VersionInfo object
+- Verify function that takes a expected version and a version requirement and returns a tuple with boolean and the observed version
+- get_version function that takes a path to a tool and a version flag and returns the version string
+- verify_from_config function that takes a path to a config file in YAML format, and checks each tool's version against the requirements. This is the main function of the library
+- README.md
+- Example code to show how to use the library
+