add colab access button

Author: MLo7Ghinsan

README.md

@@ -1,2 +1,4 @@
 # DiffSinger_colab_notebook_MLo7
-DiffSinger colab notebook that uses wav and lab as input (htk lab) for ease of use
+### DiffSinger colab notebook that uses wav and lab as input (htk lab) for ease of use
+
+## Access the notebook here: <a href="https://colab.research.google.com/github/MLo7Ghinsan/DiffSinger_colab_notebook_MLo7/blob/main/DiffSinger_colab_notebook.ipynb"> <img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab" style="width: 150px;"/> </a>