Add release notes

Author: TravisCardwell

project/release/queue-sheet-haskell-0.7.0.0.md

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+# `queue-sheet-haskell` `0.7.0.0` Release Notes
+
+Date
+: 2021-06-25
+
+## Overview
+
+This release of Queue Sheet fixes a bug and makes changes to the [Nix][]
+configuration.  There are no changes to the Queue Sheet CLI.
+
+[Nix]: <https://nixos.org/>
+
+### Big Fix
+
+This release includes a fix for a bug that broke `--help` output.  The issue
+only affected builds using `optparse-applicative` `0.16`, so none of the
+published builds were affected.
+
+### Nix Configuration
+
+The Nix configuration now supports testing against the following GHC versions
+using known working `nixpkgs` revisions:
+
+* GHC 8.2.2
+* GHC 8.4.4
+* GHC 8.8.4
+* GHC 8.10.4
+
+Note that testing against the following GHC version using Nix is currently not
+working:
+
+* GHC 8.6.5, because `ginger` is marked as broken