[Keyboard] Add Orthograph (#21770)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Vlad Kvitnevskiy <vladkvit@outlook.com>
Co-authored-by: Your Name <you@example.com>

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+# Orthograph
+
+Split ortho keyboard with RGB backlighting
+
+* Keyboard Maintainer: [vladkvit](https://github.com/vladkvit)
+* Hardware Supported: Two PCBs + thin Pro Micro compatible boards (Elite C has been extensively tested). Boards with castellated holes (Elite C style) are much easier to install. Maximum thickness is around 3-3.5mm, so a stock Pro Micro (4mm) will not work.
+* Hardware Availability: https://github.com/vladkvit/orthograph_keyboard for PCB, https://cad.onshape.com/documents/4f736d64448134c948af475a/w/ccab05fd44a7db98ce27216a/e/49ebfb6b27080b9b45bea74a?renderMode=0&uiState=64dd45dbc62cae486db10048 and https://cad.onshape.com/documents/5ff52821d2cb196f3db3d1e8/w/04b7cb21b748da89c8df31e6/e/486b72e32db97b2dfdf00af8 for the hardware 
+
+Make example for this keyboard (after setting up your build environment):
+
+    qmk compile -kb orthograph -km default
+
+Flashing example for this keyboard:
+    qmk flash -kb orthograph -km default
+    Then, flash EEPROM with handedness (left / right) on both sides.
+
+The reset button is on the underside of each half of the keyboard.
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available