Add template for Platform CI steps for a Pytools based build.
Add README to describe the template and how to use it.
Add helpful information for working with azurepipelines, templates, and
lessons learned.
Cc: Sean Brogan <sean.brogan@microsoft.com> Cc: Bret Barkelew <Bret.Barkelew@microsoft.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>