[Keyboard] Add Slimorta (#25348)

* Add Slimorta

* Update readme.md

* Apply suggestions from code review for #25348

Co-authored-by: jack <jack@pngu.org>

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Co-authored-by: jack <jack@pngu.org>

1 files changed, 23 insertions, 0 deletions

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+# Slimorta
+
+![slimorta](https://i.imgur.com/edsao2S.jpeg)
+
+Slimorta is a slim and portable ortholinear keyboard.
+
+* Keyboard Maintainer: [ASHIJANKEN](https://github.com/ASHIJANKEN)
+* Hardware Supported: Slimorta PCB, ProMicro
+* Hardware Availability: [PCB & Case Data](https://github.com/ASHIJANKEN/Slimorta)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make slimorta:default
+
+Flashing example for this keyboard:
+
+    make slimorta:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+**Physical reset button**: Press the button on the PCB twice briefly.