☕ Add help command

Author: lambdalisue

Makefile

@@ -1,16 +1,23 @@
-fmt: FORCE
+.DEFAULT_GOAL := help
+
+help:
+	@cat $(MAKEFILE_LIST) | \
+	    perl -ne 'print if /^\w+.*##/;' | \
+	    perl -pe 's/(.*):.*##\s*/sprintf("%-20s",$$1)/eg;'
+
+fmt: FORCE	## Format code
 	@deno fmt
 
-fmt-check: FORCE
+fmt-check: FORCE	## Format check
 	@deno fmt --check
 
-lint: FORCE
+lint: FORCE	## Lint code
 	@deno lint
 
-type-check: FORCE
+type-check: FORCE	## Type check
 	@deno test --unstable --no-run **/*.ts
 
-test: FORCE
+test: FORCE	## Test
 	@deno test --unstable -A
 
 FORCE: