Add TODO file

TODO

@@ -0,0 +1,19 @@
+* Feature list [4/12]
+  - [X] Generate header
+  - [X] Generate code
+  - [X] Add private struct if needed
+  - [X] Add support for post-2.38 private struct shortcut
+  - [ ] Support properties
+  - [ ] Support signals
+  - [ ] Add Gtk-Doc sections and some class documentation
+  - [ ] Add widget specialisation
+    - [ ] Standalone (with custom render function)
+    - [ ] Composite
+    - [ ] Templated composite (Generate empty template?)
+  - [ ] Display help for fields
+  - [ ] Add a GLib requirement check if 2.38 is used (with an option
+        to disable)
+  - [ ] Add a GET_PRIV macro for 2.38+
+  - [ ] Create an Emacs package
+
+# -*- mode: org