ui/curses: add curses interface draft

pqcli/ui/base.py

@@ -0,0 +1,14 @@
+import abc
+import argparse
+
+from pqcli.roster import Roster
+
+
+class BaseUserInterface(abc.ABC):
+    def __init__(self, roster: Roster, args: argparse.Namespace) -> None:
+        self.roster = roster
+        self.args = args
+
+    @abc.abstractmethod
+    def run(self) -> None:
+        raise NotImplementedError("not implemented")