add root route in app

.gitignore

@@ -2,4 +2,6 @@
 app/model_creation copy.py
 
 .venv/
-__pycache__/
+__pycache__/
+
+test/

app/main.py

@@ -9,6 +9,11 @@ from .model_creation import process_dataset
 
 app = FastAPI()
 
+
+@app.post("/")
+def read_root():
+    return {"message": "Welcome to the SwiftML Model Creation API!"}
+
 @app.post("/upload/")
 async def upload_file(target_variable: str = Form(...),
                       problem_type: str = Form(...),