Add Community Skills documentation

Document community-maintained OpenClaw skills with backup and restore instructions.

Author: JiaDe-Wu

skills/Community Skills

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+# Community Skills
+
+This repository can document useful third-party OpenClaw skills, but these are community-maintained integrations and are not part of the core AWS sample support surface.
+
+## Backup and Restore (S3 + optional KMS)
+
+- Skill repository: [genedragon/openclaw-aws-backup-skill](https://github.com/genedragon/openclaw-aws-backup-skill)
+- Purpose: encrypted backup/restore for OpenClaw workspaces and state using S3, with optional KMS.
+- Ownership: community-maintained (not maintained by `aws-samples`).
+
+### Quick start
+
+```bash
+cd /home/ubuntu/.openclaw/workspace
+git clone https://github.com/genedragon/openclaw-aws-backup-skill.git
+cd openclaw-aws-backup-skill
+npm install
+sudo npm link
+
+# first-time setup
+openclaw-aws-backup setup
+```
+
+### Common commands
+
+```bash
+openclaw-aws-backup create
+openclaw-aws-backup list
+openclaw-aws-backup restore
+openclaw-aws-backup test
+```
+
+### Security and operations notes
+
+- Use least-privilege IAM permissions for S3 and KMS.
+- Prefer KMS encryption for production backups.
+- Configure and review retention policies regularly.
+- Test restore paths before relying on backups in production.