[README] Adjusting CC BY NC 4.0 ppa instructions

Author: Murilo Marinho

docs/README.md

@@ -90,10 +90,15 @@ sudo apt-get install ros-jazzy-sas-*
 The command below will add and install the `sas` CC BY-NC 4.0 packages via `apt-get`. Please note that they depend on `sas` LGPL packages.
 
 ```bash
-TODO: Fixing PPA URL
+curl -s --compressed "https://marinholab.github.io/sas_debian_builder_noncommercial/KEY.gpg" \
+| gpg --dearmor \
+| sudo tee /etc/apt/trusted.gpg.d/smartarmstack_cc_by_nc.gpg >/dev/null
+sudo curl -s --compressed -o /etc/apt/sources.list.d/smartarmstack_cc_by_nc.list \
+"https://marinholab.github.io/sas_debian_builder_noncommercial/smartarmstack_cc_by_nc.list"
+sudo apt update
+sudo apt-get install ros-jazzy-sas-*
 ```
 
-
 ```{note}
 :class: dropdown
 # Click here for update instructions