update readme

README.md

@@ -1,4 +1,24 @@
-Node.js saucectl Wrapper
+Node.js saucectl Wrapper ![build](https://github.com/saucelabs/node-saucectl/workflows/saucectl%20pipeline/badge.svg)
 ========================
 
 Node.js wrapper for saucectl: Sauce Labs Testrunner Toolkit.
+
+## Install
+
+To install `saucectl` using NPM just run:
+
+```sh
+$ npm i -g saucectl
+```
+
+The command should be globally available:
+
+```sh
+$ saucectl -v
+saucectl version 0.4.0
+(build 7468a24c788b4ca4d67d50372c839edf03e5df6a)
+```
+
+__Note:__ if you run the command for the first time it will initially download the binary for you. This only happens once.
+
+For more information to `saucectl`, visit its main repository: [saucelabs/saucectl](https://github.com/saucelabs/saucectl).