docs: Add CLI tool section and credential storage docs

Home.md

@@ -14,6 +14,9 @@ CLI tool to authenticate with mycantaloupe.com and download the Machine List Exc
 - **`src/auth.py`** — ASP.NET FormsAuth login (CSRF token + session cookies via httpx)
 - **`src/download.py`** — Export download automation
   - Authenticate → verify access → POST `/cs4/VueMachineList/ExcelExport` → save .xlsx
+- **`cantaloupe/`** — Click CLI wrapper (`python -m cantaloupe export`)
+  - `cantaloupe/cli.py` — export + configure commands
+  - `cantaloupe/config.py` — credential management (`~/.cantaloupe.env`)
 
 ## Quick Start
 
@@ -21,15 +24,43 @@ CLI tool to authenticate with mycantaloupe.com and download the Machine List Exc
 cd ~/projects/cantaloupe-downloader
 pip install -r requirements.txt
 
-# Set credentials
+# Option 1: Save credentials to ~/.cantaloupe.env
+python -m cantaloupe configure
+
+# Option 2: Set environment variables
 export CANTALOUPE_EMAIL="your@email.com"
 export CANTALOUPE_PASSWORD="your-password"
 
 # Download export
-python -m src.download
-# Output: ~/cantaloupe-exports/Machine List_YYYYMMDD_HHMMSS.xlsx
+python -m cantaloupe export --output ./exports/
+
+# Cron/scheduled mode
+python -m cantaloupe export --scheduled --output /data/exports/
 ```
 
+## CLI Commands
+
+| Command | Description |
+|---|---|
+| `python -m cantaloupe export` | Download machine list Excel |
+| `python -m cantaloupe configure` | Save credentials to `~/.cantaloupe.env` |
+
+### Export Options
+
+| Flag | Description |
+|---|---|
+| `-o, --output PATH` | Output directory or file path |
+| `--headless / --visible` | Browser mode for Playwright fallback |
+| `--scheduled` | Non-interactive cron mode |
+| `--email TEXT` | Override account email |
+| `--password TEXT` | Override account password |
+
+## Credential Priority
+
+1. `CANTALOUPE_EMAIL` / `CANTALOUPE_PASSWORD` environment variables
+2. `~/.cantaloupe.env` file (created by `configure` command)
+3. Interactive prompt (unless `--scheduled`)
+
 ## API Details
 
 See [API Investigation](https://gitea.ourpad.casa/shawn/cantaloupe-downloader/wiki/API) for full endpoint documentation.
@@ -40,7 +71,7 @@ See [API Investigation](https://gitea.ourpad.casa/shawn/cantaloupe-downloader/wi
 
 ## Test Status
 
-47 tests passing (27 auth + 20 download) as of commit `b5ae89a`.
+86 tests passing (27 auth + 20 download + 39 CLI) as of commit `9c3d3ef`.
 
 ## Environment Variables
 
@@ -48,3 +79,5 @@ See [API Investigation](https://gitea.ourpad.casa/shawn/cantaloupe-downloader/wi
 |---|---|---|
 | `CANTALOUPE_EMAIL` | Yes | mycantaloupe.com login email |
 | `CANTALOUPE_PASSWORD` | Yes | mycantaloupe.com login password |
+
+Credentials can also be stored in `~/.cantaloupe.env` via `python -m cantaloupe configure`.