Update README table of content with DocToc
- [Submariner](#submariner)
- [Architecture](#architecture)
- - [submariner-gateway](#submariner-gateway)
- - [submariner-route-agent](#submariner-route-agent)
- [Network Path](#network-path)
- [Prerequisites](#prerequisites)
- [Installation](#installation)
- [Submariner Installation/Setup](#submariner-installationsetup)
- [Installation of Submariner in each cluster](#installation-of-submariner-in-each-cluster)
- [Validate Submariner is Working](#validate-submariner-is-working)
-- [Testing](#testing)
+- [Building and Testing](#building-and-testing)
- [Known Issues/Notes](#known-issuesnotes)
- [Openshift Notes](#openshift-notes)
-- [Building](#building)
- [Contributing](#contributing)
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