fix create folder when not existent

lib/src/lightclient.rs

@@ -120,8 +120,15 @@ impl LightClientConfig {
                 c         => panic!("Unknown chain {}", c),
             };
         }
-
-        zcash_data_location.into_boxed_path()
+        
+       // Create directory if it doesn't exist
+        match std::fs::create_dir_all(zcash_data_location.clone()) {
+            Ok(_) => zcash_data_location.into_boxed_path(),
+            Err(e) => {
+                eprintln!("Couldn't create zcash directory!\n{}", e);
+                panic!("Couldn't create zcash directory!");
+            }
+        }
     }
 
     pub fn get_wallet_path(&self) -> Box<Path> {