added build passing and go report badge
<!-- go doc / reference card -->
<a href="https://godoc.org/sigs.k8s.io/cluster-api-provider-aws">
<img src="https://godoc.org/sigs.k8s.io/cluster-api-provider-aws?status.svg"></a>
+<!-- goreportcard badge -->
+<a href="https://goreportcard.com/report/sigs.k8s.io/cluster-api-provider-aws">
+<img src="https://goreportcard.com/badge/sigs.k8s.io/cluster-api-provider-aws"></a>
</p>
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