Readme Errors

[AmoghKarve]

1. Hasura Initialization:
   Note specific to use cases of extra options to be added. Else people will blindly copy config for all different options availabe. eg using enableOverHttp() option would give 405 error for Auth/Data Services.

2. FileStore upload:
   Note specifying the second argument of file upload (/ *File * /) can be both File object as well as byte[ ].
   Also note specifying providing filename is not essential