add 8 img

Author: Roushelfy

README.md

@@ -42,4 +42,6 @@ CUDA>=11.0
 ### 6. Neohookean Model
 ![Neohookean Model](./img/6.png)
 ### 7. Neohookean Model with Self Collision
-![Neohookean Model with Self Collision](./img/7.png)
+![Neohookean Model with Self Collision](./img/7.png)
+### 8. Neohookean Model with Self  Friction
+![Neohookean Model with Self  Friction](./img/8.png)