Enhancement: Introduce build and help targets

Makefile

@@ -1,14 +1,18 @@
-vendor/autoload.php:
-	composer install --no-interaction --prefer-dist
+.PHONY: build fix help sniff test
+
+help:
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+build: fix test ## Runs fix and test targets
 
-.PHONY: fix
-fix: vendor/autoload.php
+fix: vendor/autoload.php ## Fixes code style issues with phpcbf
 	vendor/bin/phpcbf --standard=PSR2 src
 
-.PHONY: sniff
-sniff: vendor/autoload.php
+sniff: vendor/autoload.php ## Detects code style issues with phpcs
 	vendor/bin/phpcs --standard=PSR2 src -n
 
-.PHONY: test
-test: vendor/autoload.php
+test: vendor/autoload.php ## Runs tests with phpunit
 	vendor/bin/phpunit --verbose
+
+vendor/autoload.php:
+	composer install --no-interaction --prefer-dist