Add safety notice and guidelines for firmware usage

This document outlines safety precautions and responsibilities for using the firmware, including warnings about thermal, mechanical, and electrical hazards.

Author: DarkNinja-Lab

SAFETY.md

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+# Safety Notice
+
+This firmware directly controls hardware capable of causing damage, injury, or fire.
+Use at your own risk.
+
+## General Warning
+- The firmware controls heaters, motors, and power electronics
+- Misconfiguration or bugs can result in:
+  - Thermal runaway
+  - Mechanical crashes
+  - Electrical damage
+  - Fire hazards
+
+## Intended Use
+- For personal, controlled environments only
+- Not certified for commercial or unattended operation
+- Assumes basic knowledge of 3D printer hardware and firmware
+
+## Thermal Safety
+- Thermal runaway protection must remain enabled
+- Do not disable temperature limits
+- Sensor changes require validation
+- Heater behavior must be tested under supervision
+
+## Mechanical Safety
+- Respect physical limits of the machine
+- Verify endstops, homing, and travel limits
+- Do not increase speeds or accelerations blindly
+- Test motion changes at low speed first
+
+## Electrical Safety
+- Ensure proper wiring and grounding
+- Do not exceed board or PSU specifications
+- Modifications to power handling require review
+
+## Configuration Responsibility
+- Users are responsible for their configuration
+- Default values are conservative
+- Always review changes before flashing
+
+## Testing Guidelines
+- First boot after changes must be supervised
+- Keep emergency power cutoff accessible
+- Never leave the printer unattended during initial tests
+
+## Liability
+- No warranty is provided
+- The authors are not responsible for damage or injury
+- By using this firmware, you accept full responsibility
+
+## Reporting Safety Issues
+- Safety-related issues should be reported responsibly
+- Include hardware details and reproduction steps