init todos

todo.md

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+## TODO
+
+- add unit toggle/binding; `Ghz` can be fairly vague - users may prefer `Mhz`/`Hz`
+    - tldr: may be wanted for precision
+    - driver provides *hertz*, with modern cards is fairly excessive
+    - conversion is done using `format_frequency`; a wrapper of `format_size` from `humanfriendly`
+
+- restore `argparse`
+    - primarily: `--card` / `-c`, to skip `amdgpu` device detection
+    - perhaps an update interval for the Textual stat-updating timers