Document how to use auth in 2.0

[ericanderson]

Including:

• Using the new oauth libraries
• Using the old oauth libraries for conversion

[ericanderson]

Provided a working example of react-router here #651

[nihalbhatnagar]

Use Case came up where NPM README would have been useful. Additionally, we should look into creating a new public docs page in general instead of having confidential and public hidden in other TS tutorials. An osdk-ts updated readme would also be useful.