Update README.md

added https://github.com/JacobWeisenburger/freerstore

Author: JacobWeisenburger

README.md

@@ -495,6 +495,7 @@ There are a growing number of tools that are built atop or support Zod natively!
 
 #### Powered by Zod
 
+- [`freerstore`](https://github.com/JacobWeisenburger/freerstore): Firestore cost optimizer.
 - [`slonik`](https://github.com/gajus/slonik/tree/gajus/add-zod-validation-backwards-compatible#runtime-validation-and-static-type-inference): Node.js Postgres client with strong Zod integration.
 - [`soly`](https://github.com/mdbetancourt/soly): Create CLI applications with zod.
 - [`zod-xlsx`](https://github.com/sidwebworks/zod-xlsx): A xlsx based resource validator using Zod schemas.