Merge pull request FrontendMasters#1 from kristakoch/master

Adds README with link to starter files

Author: 1Marc

README.md

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+# Service Workers & Offline Course by Kyle Simpson
+
+Code for the Web Workers section of the Service Workers and Offline course by Kyle Simpson.
+
+## Starter Exercise Files
+
+To get started, download the [Starter Files (ZIP)](https://static.frontendmasters.com/resources/2019-05-10-service-worker-pwa/service-workers-starter.zip)
+
+Don't forget to `npm install` the necessary modules.