Add-Uninstall-Script (#408)

Author: Brian969

reference-artifacts/Custom-Scripts/SEA-uninstall/README.md

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+## AWS SEA Uninstall Script
+
+This uninstall script is a work in-progress and was designed for use by our development and test teams in **_non-production_** envionments. This script is destructive - **use at your own risk**.
+
+Before running this script you must manually delete AWS SSO (No API's exist)
+
+Other Notes:
+
+1. Route 53 Resolvers?
+2. Directory Service?
+
+- Operations account, unshare, delete? (Phase 2 Operations)
+
+3. SSM Keys?
+4. GuardDuty?
+5. Config?
+
+## Requirements
+
+- boto3
+- tabulate