Write readme about license issue

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 work in progress
 
-The software is licensed under GPL-3.0-or-later. But list.c and list.h contain source code I edited from book "C Primer Plus" Chapter17 practice problem 2 which contain codes from its example codes, and the author of "C Primer Plus" does not have a license for list.c and list.h, so the author of "C Primer Plus" has the copyright on list.c and list.h, so list.c and list.h can be considered non-free close souce proprietary code.
+The software is licensed under GPL-3.0-or-later. But list.c and list.h contain source code I edited from book "C Primer Plus" Chapter17 practice problem 2 which contain codes from its example codes, and the author of "C Primer Plus" does not have a license for list.c and list.h, so the author of "C Primer Plus" has the copyright on list.c and list.h, so list.c and list.h can be considered non-free close souce proprietary code. **So there's a license issue, I use both non-free and free copyleft license codes.**
 
 Read local and remote decoded CAN messages I want, append to a file, plot to a GUI with some controls. Use it with [mycan](https://git.flylightning.xyz/mycan/).