clndash: add readme

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_clndash/README.md

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+# ⚡ clndash
+
+Your Core Lightning dashboard, **without the server nonsense**.
+
+clndash is a weird little experiment: a [notedeck](https://github.com/jb55/notedeck) app that talks to your node **directly over the Lightning Network** using [`lnsocket-rs`](https://github.com/jb55/lnsocket-rs) + [Commando][commando] RPCs.
+
+No HTTP. No nginx. No VPS.
+Just open clndash, point it at your node, and boom — you’re in.
+
+---
+
+## 🤯 Why?
+
+Because sometimes you just want to *see your channels* and *check invoices* without SSH-ing into a box and typing `lightning-cli`.
+
+And because LN is already a secure, encrypted connection layer — why not just use that?
+
+---
+
+## 🔥 Features (as of today)
+
+* **Plug-and-play LN connection** – powered by [`lnsocket-rs`](https://github.com/jb55/lnsocket-rs)
+* **Commando RPC** – all dashboard data is fetched directly from your CLN node over Lightning
+* **Channel overview** – total capacity, inbound/outbound liquidity, largest channel, and pretty bars
+* **Invoices** – shows recent paid invoices (with zap previews if they came from Nostr)
+* **No extra daemons** – you don’t need to run a server to use it
+
+---
+
+## 🪄 Nostr Bonus
+
+Because it’s a notedeck app, clndash can **render zaps** inline.
+Yes, your Core Lightning dashboard can now show you when someone on Nostr just sent you sats and why.
+
+---
+
+## 🏗 Still Baking
+
+This is WIP.
+You’ll probably hit bugs. UI might be janky. Some features may vanish or suddenly mutate.
+
+If you’re reading this and still excited — you’re the exact audience.
+
+---
+
+## 🛠 How to connect
+
+1. Get your node’s **public address** (host\:port) and a **Commando rune** with safe permissions.
+2. Set them as environment variables:
+
+   ```bash
+   export CLNDASH_HOST="node.example.com:9735"
+   export CLNDASH_RUNE="your_rune_here"
+   ```
+3. Run clndash inside notedeck.
+4. Bask in the glow of real-time LN data over an LN connection.
+
+---
+
+## ⚠️ Disclaimer
+
+* Don’t give it a rune that can spend your funds.
+* Don’t blame me if you break something — this is experimental territory.
+* If it connects on the first try, buy yourself a beer.
+
+---
+
+If you like living on the edge of LN/Nostr tooling, you’ll like this.
+If you don’t… you’ll probably want to wait a bit.
+
+[commando]: https://docs.corelightning.org/reference/commando