[acs-wg] Skelton for wg draft of ACS spec.

Folks, I'm attaching the skelton for wg draft of ACS Spec. as we discussed in the call. It follows the table of contents that we discussed at May face-to-face meeting with the requirements and glossary we reviewed at meetings. Introduction description is migrated as they are from the strawman. We will also incorporate the introductory description that Tom proposed in the GGF14 session and Role description. Then we will proceed to incorporate other portions once after they got reviewed in the group. Please take a look of it and verify we can start with it. Thanks, -Keisuke