docs: banner, screenshot, dan berkas komunitas (CONTRIBUTING, CODE_OF_CONDUCT, SECURITY, CHANGELOG, template issue/PR)

CHANGELOG.md

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+# Changelog
+
+Format mengikuti [Keep a Changelog](https://keepachangelog.com/) dan [Semantic Versioning](https://semver.org/).
+
+## [0.5.0] — 2026-10-09 — "pickle-lime"
+
+Rilis open-source perdana.
+
+### Ditambahkan
+- Billing otomatis, isolir otomatis, pengingat WhatsApp, jam kalong, FUP, sinkron pemakaian.
+- Multi-router MikroTik (PPPoE & hotspot), voucher hotspot, backup konfigurasi.
+- Multi-vendor OLT (Hioso/HSGQ via SNMP; ZTE/Huawei via CLI) + `scripts/olt-probe.js`.
+- TR-069: ACS bawaan (built-in) + integrasi GenieACS.
+- RADIUS (PAP/CHAP) untuk PPPoE/hotspot.
+- Peta jaringan (Leaflet) admin & teknisi, ODP, jalur kabel.
+- Portal: admin, kasir, teknisi, kolektor, pelanggan (PWA, offline).
+- Notifikasi WhatsApp (GoWA/Baileys) & Telegram.
+- Pembayaran QRIS + webhook, kode unik, gateway opsional.
+- Antarmuka bilingual Indonesia/English.
+- Docker (Dockerfile + docker-compose), data demo (`scripts/seed-demo.js`).
+- Lisensi ISC + Wiki dokumentasi.
+
+### Kredit
+- Base kode & repo: [alijayanet/billing-rtrw](https://github.com/alijayanet/billing-rtrw) oleh **Alijaya Net**.
+- Dikembangkan menjadi OPEN-ISP oleh [oxpoe](https://github.com/oxpoe).