Adding help section to Makefile

Signed-off-by: Apoorva Mahabaleshwara <apoorvambhat@gmail.com>

Makefile

@@ -19,14 +19,20 @@ GOBIN := $(shell $(VGO) env GOPATH)/bin
 LINT := $(GOBIN)/golangci-lint
 
 all: build
-build:
+build: ## Builds all go code
 		cd ff && go build
-install:
+install: ## Installs the package
 		cd ff && go install
 
-lint: ${LINT}
+lint: ${LINT} ## Checks and reports lint errors
 		GOGC=20 $(LINT) run -v --timeout 5m
 
 ${LINT}:
 		$(VGO) install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
 
+
+help:   ## Show this help
+	@echo 'usage: make [target] ...'
+	@echo ''
+	@echo 'targets:'
+	@egrep '^(.+)\:\ .*##\ (.+)' ${MAKEFILE_LIST} | sed 's/:.*##/#/' | column -t -c 2 -s '#'