Add ADOPTERS.md

Author: jotak

ADOPTERS.md

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+> **Note**
+> Do you want to add yourself to this list? Simply fork the repository and open a PR with the required change.
+> We have a short description of the adopter types at the bottom of this page. Each adopter type is in alphabetical order. 
+
+<!-- > Once your PR is merged, see our [website repo](https://github.com/kubevirt/kubevirt.github.io?tab=readme-ov-file#adopters) to add your logo to our website. -->
+
+# NetObserv Adopters
+
+| Type | Name | Since | Website | Use-Case |
+|:-|:-|:-|:-|:-|
+| Vendor | Red Hat, Inc. | 2023 | [link](https://www.redhat.com) | Red Hat provides the Network Observability product for OpenShift, built from NetObserv, and use it internally. |
+
+### Adopter Types
+
+**End-user**: The organization runs NetObserv in production in some way.
+
+**Integration**: The organization has a product that integrates with NetObserv, but does not contain NetObserv.
+
+**Vendor**: The organization packages NetObserv in their product and sells it as part of their product.