[Keyboard] Add Durgod Hades, Galaxy and Venus Keyboards (#12893)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Don Kjer <don.kjer@gmail.com>

keyboards/durgod/dgk6x/readme.md

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+# DGK6X = Venus, Hades, Galaxy, etc.
+
+This DGK6X code is shared between the ANSI variants of Venus, Hades and Galaxy keyboards. 
+
+* Keyboard Maintainer: [J-Sully](https://github.com/J-Sully) and [dkjer](https://github.com/dkjer)
+* Hardware Supported: Durgod Venus, Hades or Galaxy board with STM32F070RBT6 
+* Hardware Availability: [Venus](https://www.amazon.com/dp/B07XFP5MMZ), [Hades](https://www.amazon.com/gp/product/B08562392T) and [Galaxy](https://www.amazon.com/Galaxy-75-Modular-Mechanical-Keyboard/dp/B08PDRD8MP)
+
+## Instructions
+
+### Build
+
+Instructions for building the Venus, Hades and Galaxy firmware can be found here: 
+* [Venus](venus/readme.md)
+* [Hades](hades/readme.md)
+* [Galaxy](galaxy/readme.md)
+
+### Initial Flash
+
+For first Flashing from initial Stock's 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 R19 to C30 on the sides closest to the processor, as shown:
+
+* Hades & Venus:
+<img src="https://i.imgur.com/JwF7MeZ.jpg" width="520" height="571" alt="Shorting Boot0 to Vdd on Hades or Venus">
+
+* Galaxy 75
+<img src="https://i.imgur.com/b9eZG5T.jpg" width="520" height="571" alt="Shorting Boot0 to Vdd on Galaxy 75">
+
+### 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
+