Update README.md

Author: tmigone

README.md

@@ -1,3 +1,7 @@
+DEPRECATED: Use https://github.com/graphprotocol/graph-tally
+
+---
+
 # Timeline Aggregation Protocol (TAP)
 
 | Crate                  | Version Badge                                                                                                      |
@@ -81,4 +85,4 @@ system being off-chain.
 
 Contributions are welcome! Please submit a pull request or open an issue to 
 discuss potential changes.
-Also, make sure to follow the [Contributing Guide](https://github.com/semiotic-ai/timeline-aggregation-protocol/blob/main/CONTRIBUTING.md).
+Also, make sure to follow the [Contributing Guide](https://github.com/semiotic-ai/timeline-aggregation-protocol/blob/main/CONTRIBUTING.md).