add hivemind placeholder extension.

lnbits/extensions/hivemind/models.py

@@ -0,0 +1,11 @@
+# from sqlite3 import Row
+# from typing import NamedTuple
+
+
+# class Example(NamedTuple):
+#    id: str
+#    wallet: str
+#
+#    @classmethod
+#    def from_row(cls, row: Row) -> "Example":
+#        return cls(**dict(row))