Renamed demo files, new demo of tabbed forms

Changed filenames to remove spaces so will be easier to work with on Linux.

Demo_Compare_Files.py

@@ -0,0 +1,33 @@
+import PySimpleGUI as sg
+
+def GetFilesToCompare():
+    with sg.FlexForm('File Compare', auto_size_text=True) as form:
+        form_rows = [[sg.Text('Enter 2 files to comare')],
+                     [sg.Text('File 1', size=(15, 1)), sg.InputText(), sg.FileBrowse()],
+                     [sg.Text('File 2', size=(15, 1)), sg.InputText(), sg.FileBrowse()],
+                     [sg.Submit(), sg.Cancel()]]
+        rc = form.LayoutAndShow(form_rows)
+    return rc
+
+def main():
+    button, (f1, f2) = GetFilesToCompare()
+    if any((button != 'Submit', f1 =='', f2 == '')):
+        sg.MsgBoxError('Operation cancelled')
+        exit(69)
+
+    with open(f1, 'rb') as file1:
+        with open(f2, 'rb') as file2:
+            a = file1.read()
+            b = file2.read()
+
+        for i, x in enumerate(a):
+            if x != b[i]:
+                sg.MsgBox('Compare results for files', f1, f2, '**** Mismatch at offset {} ****'.format(i))
+                break
+        else:
+            if len(a) == len(b):
+                sg.MsgBox('**** The files are IDENTICAL ****')
+
+
+if __name__ == '__main__':
+    main()