contrib: add tool to convert compact-serialized UTXO set to SQLite database

contrib/README.md

@@ -43,3 +43,11 @@ Command Line Tools
 
 ### [Completions](/contrib/completions) ###
 Shell completions for bash and fish.
+
+UTXO Set Tools
+--------------
+
+### [UTXO-to-SQLite](/contrib/utxo-tools/utxo_to_sqlite.py) ###
+This script converts a compact-serialized UTXO set (as generated by Bitcoin Core with `dumptxoutset`)
+to a SQLite3 database. For more details like e.g. the created table name and schema, refer to the
+module docstring on top of the script, which is also contained in the command's `--help` output.