Moved all demo programs into subfolder

DemoPrograms/Demo_Design_Patterns.py

@@ -0,0 +1,60 @@
+"""
+When creating a new PySimpleGUI program from scratch, start here.
+These are the accepted design patterns that cover the two primary use cases
+
+1. A window that closes when a "submit" type button is clicked
+2. A persistent window that stays open after button clicks (uses an event loop)
+3. A persistent window that needs access to the elements' interface variables
+"""
+# ---------------------------------#
+# DESIGN PATTERN 1 - Simple Window #
+# ---------------------------------#
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+layout = [[ sg.Text('My layout') ]]
+
+window = sg.Window('My window').Layout(layout)
+event, values = window.Read()
+
+
+# -------------------------------------#
+# DESIGN PATTERN 2 - Persistent Window #
+# -------------------------------------#
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+layout = [[ sg.Text('My layout') ]]
+
+window = sg.Window('My new window').Layout(layout)
+
+while True:     # Event Loop
+    event, values = window.Read()
+    if event is None:
+        break
+
+# ------------------------------------------------------------------#
+# DESIGN PATTERN 3 - Persistent Window with "early update" required #
+# ------------------------------------------------------------------#
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+layout = [[ sg.Text('My layout') ]]
+
+window = sg.Window('My new window').Layout(layout).Finalize()
+
+# if you have operations on elements that must take place before the event loop, do them here
+
+while True:     # Event Loop
+    event, values = window.Read()
+    if event is None:
+        break