Add How is Gatekeeper different to OPA? section (#120)
Add How is Gatekeeper different to OPA? section (#120)

* Add How is Gatekeeper different to OPA? section

Signed-off-by: Lachlan Evenson <d71daa65b1c23a15f538ae9429ab51eec6ef95f0@microsoft.com>

* Update wording based on feedback

Signed-off-by: Lachlan Evenson <d71daa65b1c23a15f538ae9429ab51eec6ef95f0@microsoft.com>

* Grammar update based on review

Signed-off-by: Lachlan Evenson <d71daa65b1c23a15f538ae9429ab51eec6ef95f0@microsoft.com>

* Grammar tweaks

Signed-off-by: Lachlan Evenson <d71daa65b1c23a15f538ae9429ab51eec6ef95f0@microsoft.com>

open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper