website: add missing page

website/source/docs/state/import.html.md

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+---
+layout: "docs"
+page_title: "State: Import Existing Resources"
+sidebar_current: "docs-state-import"
+description: |-
+  Terraform stores state which caches the known state of the world the last time Terraform ran.
+---
+
+# Import Existing Resources
+
+Terraform is able to import existing infrastructure. This allows you take
+resources you've created by some other means and bring it under Terraform management.
+
+To learn more about this, please visit the
+[pages dedicated to import](/docs/import/index.html).