bootstrap getting started tutorial

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add proxycommand setup

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add OAR elements

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'feature/new_tutorials' into devel

* feature/new_tutorials:
  add OAR elements
  add proxycommand setup
  bootstrap getting started tutorial