docs: new profile validation to prevent repeated wearables

content/ADR-XX-validate-repeated-wearables.md

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+---
+adr: XX
+date: 2023-05-09
+title: Add validation that prevents repeated wearables in profiles
+status: Draft
+authors:
+  - marianogoldman
+type: Standards Track
+spdx-license: CC0-1.0
+---
+
+## Context and Problem Statement
+
+Currently, it is possible to add the same wearable to a profile multiple times.
+This caused some issues in the Explorer, that was not expecting this to 
+happen. Even though the issue was fixed in the client, it is still possible 
+to for other clients to continue submitting profiles with repeated wearables.
+
+This ADR proposes a new validation to prevent it.
+
+## Proposed solution
+
+Add a validation to be run on profile deployment that prevents repeated
+wearables from being submitted.
+
+## Deadline
+
+    ADR75_DEADLINE: 2023-05-09T12:00:00Z
+    Unix Timestamp: 1658275200000