README improvements

Author: WyattMufson

README.md

@@ -23,14 +23,37 @@ navigator.credentials.get = function (options) {
 import Passkey from 'electron-passkey';
 
 ipcMain.handle('webauthn-create', (event, options) => {
-  return Passkey.handlePasskeyCreate(options);
+  return Passkey.getInstance().handlePasskeyCreate(options);
 });
 
 ipcMain.handle('webauthn-get', (event, options) => {
-  return Passkey.handlePasskeyGet(options);
+  return Passkey.getInstance().handlePasskeyGet(options);
 });
 ```
 
+### Entitlements Setup
+
+> **_NOTE:_** Ensure your AASA is passing validation **BEFORE** you check it against Apple's CDN **AND BEFORE** you run your application with the entitlements or Apple may temporarily cache an invalid AASA and you will be stuck until they recheck
+
+1) In developer.apple.com create an app identifier
+2) Enable Associated Domains for your identifier
+![AssociatedDomains](images/AssociatedDomains.png "Associated Domains")
+3) You may need to create a provisioning profile for macOS development on your device and/or for distribution
+4) Create a webserver to serve an AASA file [as specificed in the docs](https://developer.apple.com/documentation/xcode/supporting-associated-domains#Add-the-associated-domain-file-to-your-website)
+5) Test it with the [yURL validator](https://branch.io/resources/aasa-validator/) and/or [branch.io validator](https://branch.io/resources/aasa-validator/)
+6) Add the following to your entitlements plist
+```plist
+<key>com.apple.application-identifier</key>
+<string>TEAMID.APP-ID</string>
+<key>com.apple.developer.associated-domains</key>
+<array>
+  <string>applinks:DOMAIN</string>
+  <string>webcredentials:DOMAIN</string>
+</array>
+```
+7) Check to see if your AASA is being cached by the Apple CDN at `https://app-site-association.cdn-apple.com/a/v1/DOMAIN`
+8) Build your electron application and sign it
+
 ### Deployments
 
 ![Deployments](Deployment.png "Deplyoments")