Added changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project 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).
+
+## [Unreleased](https://github.com/digirati-co-uk/madoc-platform/compare/v1.0.0...main)
+
+## [1.0.0](https://github.com/digirati-co-uk/madoc-platform/releases/tag/v1.0.0) - 2021-10-13
+First stable release of the Tasks API.
+
+- Create custom task definitions
+- Update / Delete tasks and subtasks
+- React to task changes in events using BullMQ
+- Protected by JWT (no validation)
+  - Sandboxed using JWT issuer (`iss`)
+  - Tasks can be assigned to JWT subject (`sub`)
+  - JWT scopes: `tasks.admin`, `tasks.create`
+  - Users have access to tasks assigned to them
+- Return statistics for your tasks
+- Search / filter tasks