add truenas instructions (#896)

docs/index.md

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 webui
+nas
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docs/nas.md

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+# Network Attached Storage
+
+The following are example setups for NAS.
+
+## TrueNAS
+
+Use `Install Custom App` button to set up `icloudpd`:
+| Field | Value | Note |
+|-------|-------|------|
+Application Name | `icloudpd` |
+Version | N/A | Leave default
+Container Images/Image repository | `icloudpd/icloudpd` |
+Container Images/Image tag | `latest` |
+Container Entrypoint/Container Args | `icloudpd` `-u` `[email protected]` `-d` `/data` `--password-provider` `webui` `--mfa-provider` `webui` `--watch-with-interval` `3600` | each as a separate arg (param name and param value become two separate args)
+Port Forwarding/Container Port | `8080` |
+Port Forwarding/Host Port | `9090` | or other available port on your host
+Storage/Host Path Volumes/Host Path | /mnt/my_pool/photos | or another location on your host
+Storage/Host Path Volumes/Mount Path | /data | 
+Portal Configuration/Enable Portal Configuration | checked | 
+Portal Configuration/Portal Name | `icloudpd` | 
+Portal Configuration/Protocol to Portal | `HTTP Protocol` | 
+Portal Configuration/Use Node IP for Portal IP/Domain | checked | 
+Portal Configuration/Port | `9090` | 
+
+Once the app has started, connect to the [WebUI](webui) to enter password and MFA code one of two ways:
+- Using browser from your PC to 9090 port of your NAS
+- Clicking on `icloudp` button in Detail/Application Info section of TrueNAS portal