📝 Fill in config.properties documentation (#112)

* 📝 Fill in config.properties documentation

 - Document OKTA_PROFILE

 - Document OKTA_BROWSER_AUTH

* 🎨 Clarify OKTA_PROFILE explanation

Author: AlainODea

Readme.MD

@@ -101,6 +101,8 @@ Here is the list of parameters that must be maintained in the ```config.properti
   - ```OKTA_AWS_APP_URL``` is the url link of your Okta AWS application url (see below for more info) 
   - ```OKTA_USERNAME``` is the username to use. If present will skip username input.
   - ```OKTA_PASSWORD``` is the password to use. If present will skip password input.
+  - ```OKTA_BROWSER_AUTH``` set to **true** to use integrated web browser for authentication (default: **false**)
+  - ```OKTA_PROFILE``` is the name of the AWS profile to create/reuse (default: get AWS profile name based on per-session STS user name)  
   - ```OKTA_AWS_ROLE_TO_ASSUME``` is the role to use. If present will try to match okta account's retrieved role list and use it. Will still prompt if no match found.
   - ```OKTA_STS_DURATION``` is the duration the role will be assumed, in seconds. The maximum session duration allowed by AWS is 12 hours and this needs to be set on the role as well.  Defaults to 1hr.