Ext: Added initial extensions and README

ext/README

@@ -0,0 +1,12 @@
+Timewarrior Extensions
+======================
+
+debug.py
+  This is a debug extension that simply echoes back everything it sees in its
+  input. It's handy to see how the command line affects what an extension sees
+  and will likely be removed before release.
+
+on-modify.timewarrior
+  This is hook script that will integrate Taskwarrior and Timewarrior.
+
+

ext/debug.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+
+import sys
+
+for line in sys.stdin:
+  print '#', line.strip()

ext/on-modify.timewarrior

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+
+import sys
+
+# This is a placeholder for a Taskwarrior hook script that integrates Timewarrior
+
+# Hook should extract all of the following for use as Timewarrior tags:
+#   UUID
+#   Project
+#   Tags
+#   Description
+#   UDAs
+
+sys.exit(0)
+