[Keyboard] Add Durgod Taurus K310 keyboard (#12314)

Co-authored-by: Tyler Tidman <tyler.tidman@draak.ca>
Co-authored-by: Simon Arlott <sa.me.uk>

keyboards/durgod/k3x0/readme.md

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+# K3X0 = K310, K320, etc.
+
+This K3X0 code is shared between both the ANSI and ISO variants of both the
+K310 full-sized 104/105-key and K320 TKL 87/88-key keyboards.
+
+* Keyboard Maintainers: [dkjer](https://github.com/dkjer) and [tylert](https://github.com/tylert)
+* Hardware Supported: Durgod Taurus K310 or K320 board with STM32F070RBT6
+* Hardware Availability: K310 https://www.durgod.com/page9?product_id=53&_l=en
+                         and K320 https://www.durgod.com/page9?product_id=47&_l=en
+
+## Instructions
+
+### Build
+
+Instructions for building the K310 and K320 firmware can be found here:
+* [K310](k310/readme.md)
+* [K320](k320/readme.md)
+
+### Initial Flash
+
+For first Flashing from initial Stock Firmware
+
+1. Back up original Firmware Image:
+- Unplug
+- Short Boot0 to Vdd (See below)
+- Plug In USB
+- Make a Flash Image's Backup in case you wanted to restore the Keyboard to Stock's Image:
+  - Using dfu-util:
+
+        dfu-util --list
+        dfu-util --alt 0 --dfuse-address 0x08000000 --upload ${OLD_STOCK_BIN}
+
+2. Flash the QMK Firmware Image.
+- Put board into Bootloader mode, using the same method as when backing up the original Firmware (above)
+- Here are a few options for performing the initial Flash:
+  - Using [QMK Toolbox](https://github.com/qmk/qmk_toolbox)
+  - Using dfu-util:
+
+        dfu-util --alt 0 --dfuse-address 0x08000000 --download ${NEW_QMK_BIN}
+
+You can short Boot0 to Vdd by shorting R21 to C27 on the sides closest to the processor, as shown:
+
+<img src="https://i.imgur.com/hvDnw5a.jpg" width="520" height="693" alt="Shorting Boot0 to Vdd on K320">
+
+### Subsequent Flashing
+
+For repeating Flashing you can use BootMagic:
+- BootMagic Lite has been enabled with Assigned "Esc" key 
+- Unplug USB Cable
+- Holding Esc Button 
+- Plug in USB Cable, Keyboard should be in ST-Bootloader state