Add .gitignore, update Dockerfile, and enhance README with udev rules and calibration instructions

README.md

@@ -43,3 +43,45 @@ docker compose exec zed bash
 - USB devices are passed through via `/dev/bus/usb` and the container runs
   `privileged` for camera access.
 - The workspace is mounted at `/workspaces/zed-playground`.
+
+## Udev Rules (Host)
+
+Udev controls device permissions and power settings on the host. If ZED sensors
+fail to initialize inside the container, the host likely does not allow
+non-root access to the camera MCU/IMU or has USB autosuspend enabled.
+
+This repo provides two options:
+- `misc/99-slabs.rules`: a ready-to-use rule file that grants access to ZED
+  USB/HID devices and disables autosuspend for known ZED USB IDs.
+- `misc/udev_fix.sh`: downloads the official `99-slabs.rules`, installs it to
+  `/etc/udev/rules.d/`, and reloads udev.
+
+Run the script on the host (not in the container), then unplug/replug the
+camera so the new rules take effect.
+- `/usr/local/zed/samples` has ZED SDK sample applications.
+
+See [adujardin/setup_zed_udev-rules.sh](https://gist.github.com/adujardin/2d5ce8f000fc6a7bd40bee2709749ff8/) from stereolabs community.
+
+- [ZED camera does not open in docker container as a non-root user](https://community.stereolabs.com/t/zed-camera-does-not-open-in-docker-container-as-a-non-root-user/2259/4)
+- [CAMERA NOT DETECTED in WSL2 Ubuntu 22.04](https://community.stereolabs.com/t/camera-not-detected-in-wsl2-ubuntu-22-04/3477/5)
+
+## Calibration Download
+
+If automatic calibration download fails, grab it manually:
+
+```
+http://calib.stereolabs.com/?SN=<ZED_SN>
+```
+
+`<ZED_SN>` is the decimal serial number without the `SN` prefix.
+
+Place the downloaded `SN<XXXX>.conf` in the default settings path:
+- Linux: `/usr/local/zed/settings/`
+- Windows: `C:/ProgramData/stereolabs/settings`
+
+If you pass a custom settings path in your app, the SDK will try that first and
+fall back to the default path if the file is not found.
+
+## See also
+
+- [How to Install ZED SDK with Docker on Linux](https://www.stereolabs.com/docs/docker/install-guide-linux)