Update Makefile, README.md

We now have make install rule.

Makefile

@@ -1,9 +1,15 @@
-.PHONY: default rest-server clean
+.PHONY: default install uninstall clean
 
 default: rest-server
 
 rest-server:
-	go run build.go
+	@go run build.go
+
+install: rest-server
+	sudo /usr/bin/install -m 755 rest-server /usr/local/bin/rest-server
+
+uninstall:
+	sudo rm -f /usr/local/bin/rest-server
 
 clean:
 	rm -f rest-server