🐛 add data to repo as upstream removed CSVs

Author: enryH

docs/tutorial/data/prostate/README.md

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+# Prostate Cancer Dataset
+
+From [SurvSet](https://github.com/ErikinBC/SurvSet)

docs/tutorial/data/prostate/downlaod_data.py

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+# %%
+# pip install SurvSet
+
+# %%
+from pathlib import Path
+
+from SurvSet.data import SurvLoader
+
+loader = SurvLoader()
+# List of available datasets and meta-info
+loader.df_ds.head()
+
+# %%
+df, ref = loader.load_dataset(ds_name='prostate').values()
+
+# %%
+fname = "prostate.csv"
+
+df.to_csv(fname, index=False)