Add hardware license, gitignore, README structure, and project folders

[Copilot]

Initialize repository structure with dual licensing (software/hardware), build ignore patterns, and standard project organization.

Changes

• HARDWARE-LICENSE.md: Full CERN-OHL-S v2 text for hardware components
• .gitignore: C/C++ build artifacts (build/, *.o, *.bin, *.hex, *.elf), KiCad backups (*-cache.lib), IDE files (.DS_Store, .vscode/)
• README.md: Restructured with Summary, Features, and License sections documenting dual licensing model (GPLv3 for software, CERN-OHL-S v2 for hardware)
• Project folders: Created /Hardware, /Firmware, /Docs, /3D_Models with .gitkeep for Git tracking

## License

* **Software:**  GPLv3 (see LICENSE file).
* **Hardware:** CERN-OHL-S v2 (see HARDWARE-LICENSE.md).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• ohwr.org
  • Triggering command: curl -s REDACTED -o /tmp/cern_ohl_s_v2.txt (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add HARDWARE-LICENSE.md. Add the full, complete text of the CERN-OHL-S v2 (Strongly Reciprocal). Create .gitignore file. Ignore build files for C/C++ (like build/, *.o, *.bin, *.hex, *.elf), KiCad backup files (like *-cache.lib), and common OS/IDE files (like .DS_Store, .vscode/).
Create README.md:
Lift Altimeter
Summary

Features

License

• Software: GPLv3 (see LICENSE file).
• Hardware: CERN-OHL-S v2 (see HARDWARE-LICENSE.md).

Create folders:
/Hardware
/Firmware
/Docs
/3D_Models

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