added readme and app.py

README.md

@@ -1,5 +1,5 @@
 ---
-title: Phi-2 QLoRA Assistant Demo (CPU-Optimized)
+title: Phi-2 QLoRA Assistant
 emoji: 🤖
 colorFrom: blue
 colorTo: purple
@@ -77,6 +77,7 @@ This demo is released under the MIT License.
 ```python
 from transformers import AutoModelForCausalLM, AutoTokenizer
 from peft import PeftModel
+import torch
 
 # Load base model and adapter (CPU optimized)
 base_model = AutoModelForCausalLM.from_pretrained(