Update app.py

added product endpoint

app.py

@@ -1,7 +1,14 @@
 from fastapi import FastAPI
+import json
 
 app = FastAPI()
 
 @app.get("/")
 def home():
     return {"message": "Welcome to DemoTel Product Catalog"}
+
+@app.get("/products")
+def get_products():
+    with open("products.json", "r") as file:
+        products = json.load(file)
+    return products