* URLs have changed on the FreeRTOS.org site - this commit matches the URLs in the code with the new URLs on the website.
* Add link to device shadow directory to the shadow docs.
* Update main.c
* Update main.c
* Update readme.txt
* Update main.c
* Update main.c
* Update readme.txt
Co-authored-by: yngki <47755894+yngki@users.noreply.github.com>
