Improve docs about how to adapt ExApps to use HaRP #71
Description
Right now the docs claim that making an ExApp compatible to HaRP is as simple as installing the frpc package and using the provided start.sh script.
Unfortunately this is only true if the ExApp container runs with root. If it is using a different user (like a service user inside the Docker container with less privileges), there are a couple of file permission issues preventing the container from starting. Please see my discussion on how to fix this.
My request would be to add this information to the docs in case someone else stumbles across this issue.