chore: add pre-push hook

.githooks/README.md

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+# Git Hooks
+
+A pre-push hook which checks formatting of Rust files. Additional checks may be added in the future.
+
+# Prerequisites
+
+The following prerequisites are required:
+
+## Rust Nightly
+
+The nightly version of Rust provides additional formatting benefits over the stable version.
+
+```shell
+rustup toolchain install nightly --profile minimal --component rustfmt
+```
+
+# Installation
+
+Use the following command in the root directory of the local repository to configure Git to use the hooks:
+
+```shell
+git config core.hooksPath .githooks
+```
+

.githooks/pre-push

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+#!/bin/sh
+
+set -eu
+
+# Check Rust formatting
+if ! cargo +nightly fmt --all -- --check
+then
+    echo "There are some code style issues."
+    # shellcheck disable=SC2006
+    echo "Run 'cargo +nightly fmt --all' first."
+    exit 1
+fi
+
+exit 0