Write script for formatting code

scripts/format.sh

@@ -0,0 +1,5 @@
+cd "$(git rev-parse --show-toplevel)"
+find . -not \( -path './.git' -prune \) \
+	 -not \( -path './build' -prune \) \
+	 -name '*.c' -o -name '*.h' \
+	| xargs -n 1 clang-format -i