Add Cluster API logos from CNCF (#916)

logos/LICENSE.md

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+All artwork in this repo is made available under the Linux Foundation trademark
+usage [guidelines](https://www.linuxfoundation.org/trademark-usage/).
+
+This text from those guidelines, and the correct and incorrect usage examples, are
+particularly helpful:
+
+> Certain marks of The Linux Foundation have been created to enable you to
+> communicate compatibility or interoperability of software or products.
+> In addition to the requirement that any use of a mark to make an assertion
+> of compatibility must, of course, be accurate, the use of these marks must
+> avoid confusion regarding The Linux Foundation’s association with the product.
+> The use of the mark cannot imply that The Linux Foundation or its projects are
+> sponsoring or endorsing the product.

logos/README.md

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+# Cluster API related logos and artwork
+
+## Cluster API - It's Kubernetes all the way down
+
+![Cluster API - It's Kubernetes all the way down](kubernetes-cluster-logos_final-02.svg)
+
+[Pantone color reference](kubernetes-cluster-logos_2.pdf)
+
+## Cluster API - Clusters as Cattle
+
+![Cluster API - Clusters as Cattle](kubernetes-cluster-logos_final-01.svg)
+
+[Pantone color reference](kubernetes-cluster-logos_1.pdf)
+
+Use of any trademark or logo is subject to the trademark policy available at https://www.linuxfoundation.org/trademark-usage