Add .env file with credentials and test initialization example

Author: mojnomiya

examples/test_initialization.py

@@ -0,0 +1,25 @@
+"""Test example - validates SDK initialization and module access."""
+
+import os
+from dotenv import load_dotenv
+from steadfast import SteadfastClient
+
+load_dotenv()
+
+# Initialize client
+client = SteadfastClient(
+    api_key=os.getenv("STEADFAST_API_KEY"),
+    secret_key=os.getenv("STEADFAST_SECRET_KEY"),
+)
+
+print("✓ Steadfast SDK Test Results")
+print("=" * 50)
+print("✓ Client initialized successfully")
+print(f"✓ Orders module accessible: {type(client.orders).__name__}")
+print(f"✓ Tracking module accessible: {type(client.tracking).__name__}")
+print(f"✓ Balance module accessible: {type(client.balance).__name__}")
+print(f"✓ Returns module accessible: {type(client.returns).__name__}")
+print(f"✓ Payments module accessible: {type(client.payments).__name__}")
+print(f"✓ Locations module accessible: {type(client.locations).__name__}")
+print("=" * 50)
+print("All modules initialized successfully!")