Add LANDSCAPE.md

See gitops-working-group/gitops-working-group#166 (comment)

Signed-off-by: lloydchang <[email protected]>

Author: lloydchang

Diff for: LANDSCAPE.md

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+# GitOps Landscape {{version}}
+
+GitOps aligns with the Delivery subcategory of [CNCF Cloud Native Interactive Landscape: Continuous Integration & Delivery category](https://landscape.cncf.io/card-mode?category=continuous-integration-delivery&grouping=category).
+
+Look in [its category](https://landscape.cncf.io/card-mode?category=continuous-integration-delivery&grouping=category).
+
+Request [new entries](https://github.com/cncf/landscape#new-entries).