Typos in README

[pelanmar1]

I spotted two errors in the README example.

1. In the first example, the admin component should include firebaseConfig instead of trackedResources:

This:
<Admin restClient={RestClient(trackedResources, clientOptions)} >
should be:
<Admin restClient={RestClient(firebaseConfig, clientOptions)} >

2. The name of the attribute passed to the clientOptions.trackedResources object should be isPublic:true instead of public: true, according to the source code.