Added usage to README

README.md

@@ -6,6 +6,19 @@
 
 Convert coverage output from [Coveralls][coveralls] to an [Istanbul][istanbul] format
 
+## Usage
+
+Puppeteer to Istanbul isn't available on NPM yet, so to use it, first clone the repository. Then run the following commands:
+
+```
+node run.js your_puppeteer_coverage.json
+./node_modules/.bin/nyc report --reporter=html
+```
+
+This will run Istanbul's HTML Reporting through [nyc][nyc] based on the output of the converted `your_puppeteer_coverage.json`.
+
+To get a JSON output of your Puppeteer coverage, take a look at [this Puppeteer example](https://github.com/GoogleChrome/puppeteer/blob/v1.1.0/docs/api.md#class-coverage) of pulling coverage, and simply write the `jsCoverage` object out to a JSON file.
 
 [coveralls]: https://github.com/GoogleChrome/puppeteer
 [istanbul]: https://github.com/istanbuljs/istanbuljs
+[nyc]: https://github.com/istanbuljs/nyc