Add GuardianDB project update

Added a new entry about GuardianDB, a Rust implementation of OrbitDB.

Author: wmaslonek

draft/2025-09-24-this-week-in-rust.md

@@ -45,6 +45,8 @@ and just ask the editors to select the category.
 
 ### Project/Tooling Updates
 
+* [GuardianDB: The Rust Implementation of OrbitDB. A peer-to-peer database for the Decentralized Web.](https://www.willsearch.com.br/)
+
 ### Observations/Thoughts
 
 ### Rust Walkthroughs