Update the docs

JIRA: -

On behalf of Gerard Damm to commit his codes.
Keep docs in auto/docs.

Change-Id: I37163bd8af7ce34af0342082fa2b9fdd9357acda
Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. SPDX-License-Identifier CC-BY-4.0
+.. (c) optionally add copywriters name
+
+   
+================================================================
+Auto User Guide: Use Case 3 Enterprise vCPE
+================================================================
+
+This document provides the user guide for Fraser release of Auto,
+specifically for Use Case 3: Enterprise vCPE.
+   
+.. contents::
+   :depth: 3
+   :local:
+   
+   
+Description
+===========
+
+This Use Case shows how ONAP can help ensuring that virtual CPEs (including vFW: virtual firewalls) in Edge Cloud are enterprise-grade.
+
+ONAP operations include a verification process for VNF onboarding (i.e. inclusion in the ONAP catalog),
+with multiple Roles (designer, tester, governor, operator), responsible for approving proposed VNFs
+(as VSPs (Vendor Software Products), and eventually as end-to-end Services).
+
+This process guarantees a minimum level of quality of onboarded VNFs. If all deployed vCPEs are only
+chosen from such an approved ONAP catalog, the resulting deployed end-to-end vCPE services will meet
+enterprise-grade requirements. ONAP provides a NBI in addition to a standard portal, thus enabling
+a programmatic deployment of VNFs, still conforming to ONAP processes.
+
+Moreover, ONAP also comprises real-time monitoring (by the DCAE component), which monitors performance for SLAs,
+can adjust allocated resources accordingly (elastic adjustment at VNF level), and can ensure High Availability.
+
+DCAE executes directives coming from policies described in the Policy Framework, and closed-loop controls
+described in the CLAMP component.
+
+Finally, this automated approach also reduces costs, since repetitive actions are designed once and executed multiple times,
+as vCPEs are instantiated and decommissioned (frequent events, given the variability of business activity,
+and a Small Business market similar to the Residential market: many contract updates resulting in many vCPE changes).
+
+NFV edge service providers need to provide site2site, site2dc (Data Center) and site2internet services to tenants
+both efficiently and safely, by deploying such qualified enterprise-grade vCPE.
+
+
+Preconditions:
+
+#. hardware environment in which Edge cloud may be deployed
+#. an Edge cloud has been deployed and is ready for operation
+#. enterprise edge devices, such as ThinCPE, have access to the Edge cloud with WAN interfaces
+#. ONAP components (MSO, SDN-C, APP-C and VNFM) have been deployed onto a cloud and are interfaced (i.e. provisioned for API access) to the Edge cloud
+
+
+Main Success Scenarios:
+
+* VNF spin-up
+
+  * vCPE spin-up: MSO calls the VNFM to spin up a vCPE instance from the catalog and then updates the active VNF list
+  * vFW spin-up: MSO calls the VNFM to spin up a vFW instance from the catalog and then updates the active VNF list
+  
+* site2site
+
+  * L3VPN service subscribing: MSO calls the SDNC to create VXLAN tunnels to carry L2 traffic between client's ThinCPE and SP's vCPE, and enables vCPE to route between different sites.
+  * L3VPN service unsubscribing: MSO calls the SDNC to destroy tunnels and routes, thus disable traffic between different sites.
+
+
+See `ONAP description of vCPE use case <https://wiki.onap.org/display/DW/Use+Case+proposal%3A+Enterprise+vCPE>`_ for more details, including MSCs.
+
+
+Details on the test cases corresponding to this use case:
+
+* VNF Management
+
+  * Spin up a vCPE instance: Spin up a vCPE instance, by calling NBI of the orchestrator.
+  * Spin up a vFW instance: Spin up a vFW instance, by calling NBI of the orchestrator.
+
+* VPN as a Service
+  * Subscribe to a VPN service: Subscribe to a VPN service, by calling NBI of the orchestrator.
+  * Unsubscribe to a VPN service: Unsubscribe to a VPN service, by calling NBI of the orchestrator.
+  
+* Internet as a Service
+
+  * Subscribe to an Internet service: Subscribe to an Internet service, by calling NBI of the orchestrator.
+  * Unsubscribe to an Internet service: Unsubscribe to an Internet service, by calling NBI of the orchestrator.
+
+  
+Test execution high-level description
+=====================================
+
+<TBC>  
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