Add Example of Config-based Creation

examples/async_config_based_creation.rs

@@ -0,0 +1,20 @@
+use helius::error::Result;
+use helius::types::Cluster;
+use helius::config::Config;
+use helius::Helius;
+
+/// Demonstrates creating a Helius client with async Solana capabilities using the config-based approach
+#[tokio::main]
+async fn main() -> Result<()> {
+    let api_key: &str = "your_api_key";
+    let cluster: Cluster = Cluster::MainnetBeta;
+
+    let config: Config = Config::new(api_key, cluster)?;
+    let async_client: Helius = config.create_client_with_async()?;
+
+    if let Ok(async_conn) = async_client.async_connection() {
+        println!("Async client - Get Block Height: {:?}", async_conn.get_block_height().await);
+    }
+
+    Ok(())
+}