Adding firmware for New Proto[Typist] in-stock PCBs. (#19958)

Co-authored-by: Less/Rikki <86894501+lesshonor@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Anjheos <Anjheos.Designs@gmail.com>

keyboards/prototypist/pt80/readme.md

@@ -0,0 +1,35 @@
+# prototypist/pt80
+
+![prototypist/pt80](https://i.imgur.com/voa3ivJh.png)
+
+*Proto[Typist] Keyboards' first ever in-house universal TKL PCB designed by Josh (Anjheos). 
+Features various physical layouts available to fit multiple regional, F-row and bottom row layouts.
+Default layout is in ISO.*
+
+* Keyboard Maintainer: [Josh @ Prototypist](https://github.com/Anjheos)
+* Hardware Supported: **PT-80J PCB and PT-80C PCB**
+* Hardware Availability: [Proto[Typist]](https://prototypist.net)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make prototypist/pt80:default
+    make prototypist/pt80:via
+    make prototypist/pt80:default_ansi
+    
+
+Flashing example for this keyboard:
+
+    make prototypist/pt80:default:flash
+    make prototypist/pt80:via:flash
+    make prototypist/pt80:default_ansi: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 marked `RESET0`.
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available.