Add help target to Makefile

- And add info on running tests to readme.

Author: Shafeeq Kunnakkadan and Srihari Sriraman

Makefile

@@ -1,2 +1,13 @@
-test::
+default: help
+
+test: ## Run tests
 	lein do clean, doo phantom test once
+
+.PHONY: help
+
+help:
+	@echo "usage: make target ..."
+	@echo "available targets:"
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) \
+		| sort \
+		| awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'

README.md

@@ -84,6 +84,10 @@ Here's an example of what you''d get on creating a component
 - `:events` are `id`s of the re-frame events you can dispatch
 - `:events :refresh` needs to be implemented by the user
 
+## Running tests
+
+`make test` (requires phantomjs)
+
 ## License - Apache 2.0
 
 Copyright 2017 Omnyway Inc.