[Keyboard] Creatkeebs (#15766)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/creatkeebs/thera/readme.md

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+# thera
+A 75% keyboard
+
+![thera](https://i.imgur.com/7w7ARcPh.jpg)
+
+### Features
+* Plateless PCB gasket
+* Decent amount of layout compatibility - [View supported layouts](https://cdn.shopify.com/s/files/1/0481/5840/8853/products/8038a8b71a5149f5bad362b28368da3_590x.png?v=1628765539)
+* Ti badge
+* PVD weight (upgrade available)
+
+### Additional Information
+* Keyboard Maintainer: [Tim](https://github.com/Timliuzhaolu/qmk_firmware)
+* Hardware Supported: thera PCB
+* Hardware Availability: [ESCHIT.com](https://eschit.com/products/gb-thera75)
+
+### Entering Bootloader
+
+Enter the bootloader in 2 ways:
+
+* Physical reset button: Press the `RESET` button on the back of the PCB.
+* Keycode in layout: Press the key mapped to `RESET` if it is available.
+
+### Building the Firmware
+Make example for this keyboard (after setting up your build environment):
+
+    make creatkeebs/thera:default
+
+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).