update readme

Signed-off-by: Coline PILOQUET <coline.piloquet@rte-france.com>

Author: colinepiloquet

README.md

@@ -6,3 +6,4 @@
 - Flow decomposition notebook: [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/powsybl/pypowsybl-notebooks/main?labpath=flow_decomposition_visualization_demo.ipynb)
 - Network, load flow calculation, security analysis and sensitivity analysis [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/powsybl/pypowsybl-notebooks/main?labpath=pypowsybl_lf_security_sensitivity_analysis.ipynb)
 - Operator strategy notebook: [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/powsybl/pypowsybl-notebooks/main?labpath=operator_strategy.ipynb)
+- Network modifications in node/breaker topology notebook: [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/powsybl/pypowsybl-notebooks/main?labpath=network_modifications_node_breaker.ipynb)