feat: add org profile README with repo index

profile/README.md

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+# DongLoRa
+
+**/ˈdɒŋ.ɡəl.ɔːr.ə/** — a portmanteau of **dongle** and **LoRa**.
+
+Transparent LoRa radio over USB. Flash the firmware onto a supported board, plug it in, and send/receive LoRa packets from your computer. The firmware handles the radio; your code decides what to do with it.
+
+```
+Your code ──► client library ──┐
+Your code ──► client library ──┤
+              ...              ├──► mux daemon ──► USB serial ──► firmware ──► LoRa radio
+Your code ──► client library ──┤
+Your code ──► client library ──┘
+```
+
+## Repositories
+
+| Repo | Description | Language |
+|------|-------------|----------|
+| [firmware](https://github.com/donglora/firmware) | Embedded firmware for LoRa boards | Rust |
+| [client-rs](https://github.com/donglora/client-rs) | Rust client library (`donglora-client` on crates.io) | Rust |
+| [client-python](https://github.com/donglora/client-python) | Python client library (`donglora-python` on PyPI) | Python |
+| [mux-rs](https://github.com/donglora/mux-rs) | USB multiplexer daemon | Rust |
+| [mux-python](https://github.com/donglora/mux-python) | USB multiplexer daemon | Python |
+| [bridge](https://github.com/donglora/bridge) | P2P LoRa bridge over the internet | Rust |
+| [examples](https://github.com/donglora/examples) | Demo scripts — receive, transmit, bridge | Python |
+| [ai-bot](https://github.com/donglora/ai-bot) | MeshCore AI chatbot (default mesh name: "Orac") | Python |