Add guide to take over abandoned collection

Author: Ndpnt

content/collections/how-to/take-over.md

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+---
+title: Take over abandoned collection
+weight: 2
+---
+
+# How to take over maintenance of abandoned collection
+
+Before starting, ensure the collection is [abandoned]({{< relref "collections/reference/status#abandoned" >}}).
+
+## Steps
+
+1. Get owners' approval by contacting them via email if publicly available, a GitHub issue on the collection repository or on the [community chat]({{< relref "federation/how-to/join" >}}).
+
+2. Ask the owner to transfer the repositories to your organization.
+
+3. Verify that the declarations, snapshots and versions repositories are transferred and properly configured by taking a look at [this guide]({{< relref "collections/how-to/create-repositories/" >}}).
+
+3. Update Readme, and follow [this guide to update collection metadata]({{< relref "collections/how-to/define-metadata" >}}) inside the declarations repository.
+
+4. Follow [this guide to deploy the collection]({{< relref "deployment/how-to/deploy" >}}) on your server.
+
+5. Ensure continous integration and deployment is working.
+
+Congratulations! You can now start maintaining the collection.
+
+Keep original licenses and attributions.