add link to cards example

README.md

@@ -58,7 +58,7 @@ Published in [ACM Transactions on Graphics (TOG)](https://dl.acm.org/doi/abs/10.
 
 ## 📝 Change History
 
-- (2024.12.21) Added a house of cards example [[Video]](https://drive.google.com/file/d/14KXaapSIM0qYcdp6yFVyNlfFWGwqCpGA/view?usp=sharing)
+- (2024.12.21) Added a [house of cards example](./examples/cards.ipynb) [[Video]](https://drive.google.com/file/d/14KXaapSIM0qYcdp6yFVyNlfFWGwqCpGA/view?usp=sharing)
 - (2024.12.18) Added a [frictional contact example](./examples/friction.ipynb): armadillo sliding on the slope [[Video]](https://drive.google.com/file/d/12WGdfDTFIwCT0UFGEZzfmQreM6WSSHet/view?usp=sharing)
 - (2024.12.18) Added a [hindsight](./articles/hindsight.md) noting that the tilt angle was not $30^\circ$, but rather $26.57^\circ$
 - (2024.12.16) Removed thrust dependencies to fix runtime errors for the driver version `560.94` [[Issue Link]](https://github.com/st-tech/ppf-contact-solver/issues/1)