This is and independent proyect, but PRs are welcome!
Now compatible with the plugin manager of your choice!
Recommended: vim-plug
First, clone the repository to an empty directory on your machine:
mkdir Peoplecode-Syntax-For-Vim
cd Peoplecode-Syntax-For-Vim
git init && git pull https://github.com/FidelSch/PeopleCode-Syntax-For-Vim.git
Then, copy the files under each directory to ~/.vim/<folder-name>
You may have to create them if they don't exist.
mkdir ~/.vim/syntax
cp Peoplecode-Syntax-For-Vim/syntax/* ~/.vim/syntax/
The next time you open a .ppl file, it should be highlighted accordingly.
Happy coding!