Merge pull request #6204 from chrislovecnm/vsphere-dev-docs

vSphere provider developer docs

builtin/providers/vsphere/README.md

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+# Terraform vSphere Provider Dev Docs
+
+This document is in place for developer documentation.  User documentation is located [HERE](https://www.terraform.io/docs/providers/vsphere/) on Terraform's website.
+
+Thank-you [@tkak](https://github.com/tkak) and [Rakuten, Inc.](https://github.com/rakutentech) for there original contribution of the source base used for this provider!
+
+## Introductory Documentation
+
+Both [README.md](../../../README.md) and [BUILDING.md](../../../BUILDING.md) should be read first!
+
+## Base API Dependency ~ [govmomi](https://github.com/vmware/govmomi) 
+
+This provider utilizes [govmomi](https://github.com/vmware/govmomi) Go Library for communicating to  VMware vSphere APIs (ESXi and/or vCenter).
+Because of the dependency this provider is compatible with VMware systems that are supported by govmomi. Much thanks to the dev team that maintains govmomi, and
+even more thanks to there guidance with the development of this provider.  We have had many issues answered by the govomi team!
+
+#### vSphere CLI ~ [govc](https://github.com/vmware/govmomi/blob/master/govc/README.md)
+
+One of the great tools that govmomi contains is [govc](https://github.com/vmware/govmomi/blob/master/govc/README.md). It is a command line tool for using the govmomi API.  Not only is it a tool to use, but also it's 
+[source base](https://github.com/vmware/govmomi/blob/master/govc/) is a great resource of examples on how to exercise the API.