Create CHANGELOG.md

Author: lorensr

CHANGELOG.md

@@ -0,0 +1,26 @@
+# Changelog
+All notable changes will be documented in this file.
+
+This file applies to the app that is created in Chapter 8 of the book—so the numbered step branches, not `master`.
+
+Releases are done with tags in the form `[step]_[version]`, so for instance step `3` of version `1.0.0` is `3_1.0.0`, located here: 
+
+[/GraphQLGuide/guide-android/releases/tag/3_1.0.0](https://github.com/GraphQLGuide/guide-android/releases/tag/3_1.0.0)
+
+<!-- ## [Unreleased]
+### Added
+### Removed
+### Changed
+### Fixed -->
+
+## [1.0.0] - 2021-04-06
+Released with [`r6`](https://github.com/GraphQLGuide/book/releases/tag/r6)
+
+### Added
+- Branches `0-3`
+
+```
+@apollo/client 3.2.1
+expo 39.0.2
+react 16.13.1
+```