ESPHome external component for Samsung 2x20 serial VFD

Component (components/samsung_vfd), example device config, README and
CLAUDE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/secrets.yaml.example

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+# Copy to secrets.yaml (next to your device yaml) and fill in.
+wifi_ssid: "your-ssid"
+wifi_password: "your-wifi-password"
+ota_password: "choose-an-ota-password"
+fallback_password: "choose-a-fallback-ap-password"
+# Generate with: python -c "import secrets,base64;print(base64.b64encode(secrets.token_bytes(32)).decode())"
+api_key: "base64-32-byte-key"