update readme

Added Airdrop Claim Reference Implementations section with links to basic and advanced examples.

Author: tilo-14

README.md

@@ -4,6 +4,13 @@
 
 ## Examples
 
+## Airdrop Claim Reference Implementations
+
+* **Basic**: [**simple-claim**](https://github.com/Lightprotocol/program-examples-airdrop-implementations/simple-claim) - Distributes compressed tokens that get decompressed to SPL on claim.
+* **Advanced**: [**merkle-distributor**](https://github.com/Lightprotocol/distributor) - Distributes SPL tokens, uses compressed PDAs to track claims with linear vesting, partial claims, clawback and admin controls.
+
+For simple client side distribution visit [this example](https://github.com/Lightprotocol/example-token-distribution).
+
 ### Basic Operations
 
 - **[basic-operations/anchor](./basic-operations/anchor/)** - Anchor program with Rust and TypeScript tests