add steel in workspace

Author: heyAyushh

Cargo.toml

@@ -15,6 +15,7 @@ members = [
     "basics/cross-program-invocation/anchor/programs/*",
     "basics/hello-solana/native/program",
     "basics/hello-solana/anchor/programs/*",
+    "basics/hello-solana/steel/*",
     "basics/pda-rent-payer/native/program",
     "basics/pda-rent-payer/anchor/programs/*",
     "basics/processing-instructions/native/program",