Add levulinic_acid_species dataset

levulinic_acid_species/data/train-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:3e493a1da2791d11c100aa37e4be40da5475826d01a9ae0e5d0becb8e990613e
+size 7557413

levulinic_acid_species/metadata.json

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+{
+  "target_names": [
+    "pH",
+    "Mass of NaOH"
+  ],
+  "task_type": 2
+}