doc: add submodules on clone in README

README.md

@@ -32,7 +32,7 @@ fhEVM-go gives your EVM the ability to compute on encrypted data using fully hom
 In order to use the library, you need to clone the repository and build it. This is required because the library depends on the `tfhe-rs` library that needs to be built from source (for now), and Go doesn't support such a build.
 
 ```bash
-$ git clone https://github.com/zama-ai/fhevm-go
+$ git clone --recurse-submodules https://github.com/zama-ai/fhevm-go
 $ cd fhevm-go
 $ make build
 ```