docs: update root readme

README.md

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-# ROLA
+# ROLA (Radix Off-Ledger Authentication)
+
+ROLA is a method of authenticating something claimed by the user connected to your dApp with the Radix Wallet. It uses the capabilities of the Radix Network to make this possible in a way that is decentralized and flexible for the user.
+
+ROLA is intended for use in the server backend portion of a Full Stack dApp. It runs "off-ledger" alongside backend business and user management logic, providing reliable authentication of claims of user control using "on-ledger" data from the Radix Network.
+
+## Resources
+
+[What is ROLA](https://docs-babylon.radixdlt.com/main/frontend/rola.html)
+
+## Implementations
+
+- [NPM](https://www.npmjs.com/package/@radixdlt/rola)
+
+## Documented examples
+
+- [Typescript full-stack](/examples/typescript-full-stack/README.md)