Added ADR for etcd status

Signed-off-by: Vitor Savian <vitor.savian@suse.com>

docs/adrs/status-for-etcd-node.md

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+# A way for seeing the status of the etcd node
+
+Date: 2023-09-14
+
+## Status
+
+Decided
+
+## Context
+
+It is difficult for a user to see if the etcd status has changed from learner to voter. 
+As a result, there is a need for a controller or condition to make it easier for the user to view the status of their etcd node and how it is running.
+
+One issue with not having this controller or condition is that when a cluster is provisioned with scaling, 
+it's quite possible for the cluster to break due to quickly adding or removing a node for any reason.
+
+With this feature, the user will be able to have a better understanding of the etcd status for each node, thus avoiding problems when provisioning clusters.
+
+## Decision
+
+We decided to add a status flag on our etcd controller.
+
+## Consequences
+
+Good:
+- Better view of the etcd status