make a readme, put todo notes in it

README.md

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+# bloom-plugin-service-worker
+
+A Cordova plugin to add a fake ServiceWorker to WKWebView.
+
+Requirements:
+ - Using cordova-plugin-ionic-webview & the associated GCDWebServer
+ - Have a preference set for RemoteServerUrl in config.xml that
+   indicates the backend server you want the requests to go to.
+
+Still a work in progress
+
+Notes: after implementing the integration with GCDWebServer, it seems like the postMessage immediately finishes & sends the message back, but the webview doesn't seem to actual recieve the message & keep going. Something going wrong at some point along the way now?
+Did recently change how the request that gets handed to the fetch handler works, because the headers needs to be an actual Header object, not just a plain Object; did that break something?