Add figures directory and requirements.txt for python

figures/.gitignore

+venv
\ No newline at end of file

figures/requirements.txt

+contourpy==1.3.1
+cycler==0.12.1
+fonttools==4.56.0
+kiwisolver==1.4.8
+matplotlib==3.10.1
+numpy==2.2.4
+packaging==24.2
+pillow==11.1.0
+pyparsing==3.2.1
+python-dateutil==2.9.0.post0
+scipy==1.15.2
+six==1.17.0