Create TODO_MINOR.md

TODO_MINOR.md

+# TODOs for minor versions
+Minor versions released when one or more new feature is addded without changing the API
+
+## Ideas
+- label: add a horzintal line (e.g. underline or line through). 
+- label long mode: dot begin
+- music player app
+- files app update: show content as text
+- controll GUI with serial port
+- automatically build GUI from file (e.g. XML, JSON or HTML)
+
+## v4.2
+- [x] lv_group: to control without touch pad. Issue [#14](https://github.com/littlevgl/lvgl/issues/14)
+- [x] lv_page: scrl def fit modification: hor:false, ver:true, and always set width to parent width
+- [x] lv_btn: add lv_btn_get_..._action
+- [x] lv_list: add lv_list_get_element_label/img
+- [x] style animations add
+- [ ] btnm:  besides 0. byte (width dsc) 1. byte: hidden (\177, 0x7F, delete)