Add nt210 config to QMK

[evyd13]

Description

Adds the nt210, a custom PCB for the Leopold FC210TP, to QMK.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[ikbenkous]

When using the default keymap, I am unable to "press ESC during power up" to enter the bootloader.
BOOTMAGIC_ENABLE is not yes and thus 'bootmagic lite' is not compiled in. This seems to effectively prevent me from flashing (without using the reset switch on the back of the PCB hidden inside the case).

Putting BOOTMAGIC_ENABLE = yes in the keyboards/evyd13/nt210/rules.mk seems to fix it.

The via keymap seems fine and does correctly enter the bootloader.

[evyd13]

🥺🙏

[drashna]

Thanks!