add Frames class

itten/frames.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from pathlib import Path
+
+
+class Frames(object):
+    """docstring for frames"""
+
+    frm_set = [] 
+
+    def __init__(self, arg):
+        super(frames, self).__init__()
+        self.prefix 
+        self.folder =
+        self.cnt = 
+        self.step =
+        self.freq =
+        self.start =
+        self.end =
+
+    def _crt_frm_set(self):
+        frm_path = Path(frm_fld)
+        frames = list(frm_path.glob('*.png'))