[Keyboard] Add Olly Orion to QMK (#19134)

Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/mechlovin/olly/orion/readme.md

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+# Olly Orion
+
+![Olly Orion](https://i.imgur.com/midAJSplh.jpeg)
+
+The Olly Orion is designed as a drop-in replacement PCB for the Duck Orion V2; V2.5 and V3 TKL custom keyboards. 
+
+* Keyboard Maintainer: [Mechlovin' Studio](https://github.com/mechlovin)
+* Hardware Supported: Olly Orion, APM32F103.
+* Hardware Availability: [Mechlovin' Studio](https://mechlovin.studio), [GB](https://www.reddit.com/r/mechmarket/comments/z1i5g3/gb_mechlovin_olly_orion_octagon_duck_orion/).
+
+Make example for this keyboard (after setting up your build environment):
+
+    make mechlovin/olly/orion:default
+
+Flashing example for this keyboard:
+
+    make mechlovin/olly/orion/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).
+
+**Reset Key:** 3 ways to put the IF87.5 into bootloader:
+- By keycode: Tap RESET keycode.
+- By bootmagic: hold ESC key while plugging in.
+- By hardware: Push reset button on bottom of the PCB while the PCB is plugged in.