Added a list of TODOs.

README.md

@@ -53,3 +53,10 @@ Each output dataset must satisfy the following requirements:
 - The output dataset must be a single text file with one tree per line.
 - The trees must be in bracket notation.
 - The trees must be sorted by size.
+
+## TODO
+
+- [ ]Explicitly break ties in sorting: first size, then bracket notation strings lexicographically.
+  Example: `sort -k1,1nr -k2 data`
+- [ ]Publish snapshots of raw data.
+- [ ]Add where the raw data should be fetched from: original source, our snapshot.