added the description of a proposed startup sequence

main.py

@@ -0,0 +1,32 @@
+#!/usr/bin/python2
+
+#proposed launcher startup sequence
+#
+# - look at command line arguments
+#     possible arguments:
+#       --ui:gui, --ui:cli-interactive, --ui:args-only, --ui:auto (default: auto)
+#       --update:if-available, --update:force, --update:noupdate (default: if-available)
+#       --launch, -l (default: not present)
+#       --silent, --quiet, -s, -q (default: not present)
+#
+# - decide whether to launch the GUI or not (either by command line argument
+#   or by determining if running from terminal)
+#
+# - if updating: install update and restart if in GUI mode or interactive CLI mode,
+#   update and exit in args-only mode
+#
+# - launch GUI or launch interactive CLI or follow instructions from the
+#   command line:
+#       If --ui:args-only is present, the default actions are update:if-available
+#       and exit without launching. If -l is present, the GUI or
+#       interactive CLI are only shown while updating and Minecraft will launch
+#       automatically.
+#
+# - load configuration
+#
+# - handle user actions (only in GUI or interactive mode, skipped with -l)
+#     - update and store configuration
+#     - GUI interaction
+#     - wait for launch or close actions
+#
+# - launch the game or exit