updated readme

app.py

@@ -129,6 +129,10 @@ demo = gr.ChatInterface(
     description="""
     <b>Portfolio Project:</b> A specialized math solver fine-tuned on GSM8K using LoRA.
     <br><br>
+    <a href='https://github.com/HariHaran9597/Math-solver/blob/main/MATH_agent.ipynb' target='_blank'>
+        <img src='https://colab.research.google.com/assets/colab-badge.svg' alt='Open In Colab'/>
+    </a>
+    <br><br>
     <b>⚠️ Performance Note:</b> This demo runs on <b>Free CPU Tier</b>.
     <ul>
         <li><b>First Request:</b> May take 1-2 mins (Cold Start).</li>