[chore] add TODO list for project enhancements

TODO.md

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+- create folder models/ if not present -> use /usr/share/polyscribe/models/ for release version, use ./models/ for development version
+- create missing folders for output files
+
+- for merging (command line flag) -> if not present, treat each file as separate output (--merge | -m)
+- for merge + separate output -> if present, treat each file as separate output and also output a merged version (--merge-and-separate)
+- set speaker-names per input-file -> prompt user for each file if flag is set (--set-speaker-names)
+
+- add support for video files -> use ffmpeg to extract audio
+
+- detect gpus and use them
+- add error handling
+- add tests
+
+- add verbose flag (--verbose | -v) + add logging
+
+- refactor into multiple files
+
+- rename project to "PolyScribe"
+
+- add documentation
+- package into executable
+- add CI
+- add package build for arch linux