feat: add readme

README.md

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+# nossh
+
+A lightning-fast SSH endpoint finder and launcher with fuzzy history lookup and ⬢ `.ssh/config` reference.
+
+---
+
+## Features
+
+- **Fuzzy history search**  
+  Quickly fuzzy-find and re-run past `ssh` commands you’ve executed.
+
+- **`.ssh/config` lookup**  
+  Instantly search host entries from your `~/.ssh/config`.
+
+- **Interactive mode**  
+  Presents a searchable list of endpoints for one-shot selection.
+
+- **External invocation**  
+  Falls back to standard `ssh` when provided arguments.
+
+- **Configurable config path**  
+  Override the default `~/.ssh/config` via an `--ssh-config-path` flag or `SSH_CONFIG_PATH` env var.
+
+---
+
+## Installation
+
+```bash
+cargo install nossh
+````
+
+Or build from source:
+
+```bash
+git clone https://github.com/yourorg/nossh.git
+cd nossh
+cargo build --release
+cp target/release/nossh /usr/local/bin/
+```
+
+---
+
+## Quickstart
+
+1. **Launch interactive search**
+
+   ```bash
+   nossh
+   ```
+
+   * Fuzzy-find against:
+
+     * Your cached history of `ssh …` commands.
+     * Host entries in your `~/.ssh/config`.
+
+2. **Run a past command or config entry**
+
+   ```bash
+   # Start typing “git.fr” and press Enter:
+   $ nossh
+     1. ratchet:22
+     2. somegateway:222
+   # 3. git.front.kjuulh.io
+   > git.fr
+   # then Enter runs:
+   ssh git.front.kjuulh.io
+   ```
+
+3. **Direct `ssh` passthrough**
+
+   ```bash
+   nossh user@host -p 2222
+   ```
+
+   Behaves exactly like `ssh …`; also logs the invocation for future fuzzy lookup.
+
+---
+
+## Usage
+
+```text
+nossh [--ssh-config-path <path>] [<ssh-args>...]
+```
+
+| Option                   | Description                                                                                    |
+| ------------------------ | ---------------------------------------------------------------------------------------------- |
+| `--ssh-config-path PATH` | Path to your SSH `config` file (default: `~/.ssh/config`). Overrides `SSH_CONFIG_PATH` env var |
+| `<ssh-args>…`            | If provided, forwarded to `ssh` as normal.                                                     |
+
+### Environment
+
+* `SSH_CONFIG_PATH`
+  Alternative way to point to your SSH config:
+
+  ```bash
+  export SSH_CONFIG_PATH="/custom/path/config"
+  ```
+
+---
+
+## Configuration
+
+The default SSH config path is `${HOME}/.ssh/config`. If that file is missing or you wish to use a different config, set the flag or env var:
+
+```bash
+nossh --ssh-config-path /mnt/shared/ssh_config
+```
+
+---
+
+## How It Works
+
+1. **Startup**
+
+   * Reads `~/.ssh/config` (or your override).
+   * Loads your SSH‐command history database (`~/.local/share/nossh/db.sqlite3`).
+
+2. **Interactive Mode**
+
+   * Presents a fuzzy prompt (via `fzf`-style) combining:
+
+     * Host patterns from config.
+     * Host strings from history (e.g. `user@host -p 2222`).
+
+3. **Selection**
+
+   * On Enter, launches `ssh` with the selected arguments.
+   * In external (non-interactive) mode, simply proxies `ssh …` and appends to history.
+
+---
+
+## Examples
+
+* **Basic interactive**
+
+  ```bash
+  nossh
+  ```
+
+* **Forced interactive**
+
+  ```bash
+  nossh interactive
+  ```
+
+* **One-liner passthrough**
+
+  ```bash
+  nossh -i ~/.ssh/id_ed25519 root@example.com
+  ```
+
+---
+
+## Development
+
+Clone and run tests:
+
+```bash
+git clone https://github.com/kjuulh/nossh.git
+cd nossh
+cargo test
+```
+
+---
+
+## License
+
+MIT-licensed
+
+```
+