add todo file

TODO.md

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+# VSE ToolBox
+
+In-House Video editing Tools
+
+### Todo
+- [ ] Get Set asset_types to project 
+- [ ] implement clear all casting / or choosing by type (enum en expand ?)
+- [ ] implement copy casting by type (all, chars, props etc...)
+
+### In Progress
+
+### Done ✓
+<!-- - [x] Completed task title -->