[Keyboard] Add saevus cor (#18368)

keyboards/saevus/cor/readme.md

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+# saevus cor
+
+![saevus cor](https://i.imgur.com/AOT6mmMl.jpg)
+
+An exploded 65% with a macro column.
+
+* Keyboard Maintainer: [Ramon Imbao](https://github.com/ramonimbao)
+* Hardware Supported: ATmega32u4
+
+Make example for this keyboard (after setting up your build environment):
+
+    make saevus/cor:via
+    
+Flashing example for this keyboard:
+
+    make saevus/cor:via: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 upper left key and plug in the keyboard
+* **Physical reset button**: Briefly press the reset button on the back of the PCB.
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available