examples readme

examples/README.md

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+# Examples
+
+### Mapping of a reaction data set
+
+Requires a data set file (.csv, .tsv, .json) with a "rxn" column.
+
+```bash
+python ../scripts/run_rxnmapper_on_dataset.py  \
+    --file_path example_rxns.csv \
+    --output_path  out.json \
+    --batch_size 8
+```