Add Eclipse60 / tinyneko (#19379)

keyboards/sawnsprojects/eclipse/eclipse60/readme.md

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+# eclipse60
+
+![eclipse60](https://i.imgur.com/0nttqlth.png)
+
+ A 60% Opensource PCB make for Eclipse60, Bakeneko, TGR Unikorn and some board with same O-ring mounting point.
+
+* Keyboard Maintainer: [Mai The San](https://github.com/MaiTheSan)
+* Hardware Supported: Eclipse60, Bakeneko, TGR Unikorn
+* Hardware Availability: Private GB, [Opensource](https://github.com/MaiTheSan/EclipsePhrase160)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make eclipse/eclipse60:default
+
+Flashing example for this keyboard:
+
+    make eclipse/eclipse60: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
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available