Adjusted project setup guide for robotic template.

Change summary

I've used --all-gems-path and --all-templates-path instead of listing individual directories. Added note on Physx 5.

[ x ] Descriptive active voice - Do descriptive sentences have a clear subject and action verb?
[ x ] Answer the question at hand - Does the documentation answer a what, why, how, or where type of question?
[ x ] Consistency - Does the content consistently follow the Style Guide?
[ x ] Help the user - Does the documentation show the user something meaningful?