Add docs for multi-cluster install (openshift-service-mesh#157)

* Add docs and setup script for multi-cluster install

Signed-off-by: Nick Fox <[email protected]>

* Apply suggestions from code review

Co-authored-by: Sridhar Gaddam <[email protected]>
Signed-off-by: Nick Fox <[email protected]>

* Update docs/README.md

Co-authored-by: Marko Lukša <[email protected]>
Signed-off-by: Nick Fox <[email protected]>

* Apply suggestions from code review

Co-authored-by: Marko Lukša <[email protected]>
Signed-off-by: Nick Fox <[email protected]>

* Use github URL references and trim down examples

Signed-off-by: Nick Fox <[email protected]>

* Use multi-cluster consistently and update pre-reqs

Signed-off-by: Nick Fox <[email protected]>

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Signed-off-by: Nick Fox <[email protected]>
Co-authored-by: Sridhar Gaddam <[email protected]>
Co-authored-by: Marko Lukša <[email protected]>

Author: 3 people