added log file

src/bilogger.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Creator: Video2X Bidirectional Logger
+Author: K4YT3X
+Date Created: June 4, 2020
+Last Modified: June 4, 2020
+"""
+
+# built-in imports
+import _io
+import pathlib
+
+
+class BiLogger(object):
+    """ A bidirectional logger that both prints the output
+    and log all output to file.
+
+    Original code from: https://stackoverflow.com/a/14906787
+    """
+
+    def __init__(self, terminal: _io.TextIOWrapper, logfile: pathlib.Path):
+        self.terminal = terminal
+        self.log = logfile.open(mode='a+')
+
+    def write(self, message):
+        self.terminal.write(message)
+        self.terminal.flush()
+        self.log.write(message)
+        self.log.flush()
+
+    def flush(self):
+        pass