docs: add instructions for updating adopters

Add several options for updating the list of community members
who have adopted rook.

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

ADOPTERS.md

@@ -1,9 +1,26 @@
-# Rook Adopters
+# Adopters
 
-Below is a list of adopters of Rook in **production environments** that have publicly shared the
-details of their usage as well as the benefits provided by Rook that their business relies on. There
-are additional adopters of Rook, especially those with on-premises deployments, that are not ready
-to share the details of their usage publicly at this time.
+Below is a list of adopters of Rook in **production environments** that have publicly shared
+their usage as well as the benefits provided by Rook that their business relies on.
+If you are an adopter of Rook and not yet on this list, we encourage you to add your organization here as well!
+
+The goal for this list is give inspiration to others who are starting their Rook journey.
+Thank you to all adopters and contributors of the Rook project!
+
+## Updating this list
+
+To add your organization to this list, choose one of the following options:
+
+- [Open a PR](https://rook.io/docs/rook/latest/Contributing/development-flow/#submitting-a-pull-request) to directly update this list
+- [Open a new issue](https://github.com/rook/rook/issues/new/choose) with the information
+- Send an email to [Steering committee members](https://github.com/rook/rook/blob/master/OWNERS.md#steering-committee) with the information
+
+For the latter two options, a maintainer will submit a PR to update the table.
+Please reach out to us on [Slack](https://slack.rook.io) with any questions.
+
+If submitting a description, the addition will be at the end of first part of the list. If a description is not provided, the addition will be at the end of the full list.
+
+## Rook Adopters
 
 * [Calit2 (California Institute for Telecommunications and Information
   Technology)](http://www.calit2.net/) is one of 4 institutes formed by a joint partnership of
@@ -58,6 +75,3 @@ to share the details of their usage publicly at this time.
 * [infraBuilder](https://infrabuilder.com/)
 * [GreenCom Networks](http://www.greencom-networks.com/en)
 * [PITS Global Data Recovery Services](https://www.pitsdatarecovery.net/)
-
-There are many additional adopters of Rook in the evaluating phase that will be added to this list
-as they transition to production deployments.