[RA1 Ch04] Add IMplementation Tools for 4.5.1 Edge (#2351)

* [RA1 Ch04] Add IMplementation Tools for 4.5.1 Edge

Fixes #2297

* Update doc/ref_arch/openstack/chapters/chapter04.md

* Update doc/ref_arch/openstack/chapters/chapter04.md

doc/ref_arch/openstack/chapters/chapter04.md

@@ -747,4 +747,11 @@ Table 8-4 in the Reference Model Chapter 8.3.4 "[Telco Edge Cloud: Platform Serv
 
 Table 8-3 in the Reference Model Chapter 8.3.3 "[Telco Edge Cloud Infrastructure Profiles](https://github.com/cntt-n/CNTT/blob/master/doc/ref_model/chapters/chapter08.md#8.3.3)", lists a number of Infrastructure Profile characteristics and the changes that may need to be made for certain Edge clouds depending upon their resource capabilities. It should be noted that none of these changes affect the definition of OpenStack flavours.
 
+#### 4.5.1.1 Edge Cloud Deployment
 
+Deployment at the Edge requires support for large scale deployment. A number of open-source tools are available for the purpose including:
+- [Airship](https://docs.airshipit.org/): declaratively configure, deploy and maintain an integrated virtualization and containerization platform
+- [Starling-X](https://www.starlingx.io/): cloud infrastructure software stack for the edge
+- [Triple-O](https://wiki.openstack.org/wiki/TripleO): for installing, upgrading and operating OpenStack clouds 
+
+The Reference Implementation (RI1) is responsible to choose the tools for the implementation and shall specify implementation and usage details of the chosen tools.