Add readme describing the data in the dataset.

README.md

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+# Full FLIP stability dataset
+
+The stability dataset from flip, which is based on the meltome atlas, data has those columns:
+
+```
+[ 'index', 'seq_id', 'sequence', 'target', 'cluster_center',
+       'cluster_distance']
+       ```
+       
+- **Index** from the original dataset
+- **Seq_id** a unique sequence ID string that is concatenated from several other IDs (also Unirep)
+- **Sequence** The actual protein sequence as a string
+- **Target** the melting point temperature of the protein TM 
+- **Cluster center** The seq_id of the cluster center protein this sequence is assigned to. Can also be its won seq_id if this sequence is a center.
+- **Cluster distance** The levenstein distance of the protein to its cluster center.