opxrd/usage: Added multi pattern PCA example

Author: Somerandomguy10111

opxrd/usage.ipynb

@@ -3,7 +3,7 @@ name = "opxrd"
 version = "0.1.0"
 authors = [{name = "Daniel Hollarek", email = "[email protected]"}]
 description = "Python API for opXRD database. See more at https://xrd.aimat.science/"
-dependencies = ["holytools", "xrdpattern"]
+dependencies = ["holytools", "xrdpattern","scikit-learn"]
 
 [tool.setuptools.packages.find]
 include = ["opxrd"]