Add Swoop keyboard (#18436)

keyboards/bluebell/swoop/readme.md

@@ -0,0 +1,27 @@
+# Swoop
+
+![Swoop](https://i.imgur.com/mMlmEsdh.jpg)
+
+*The Swoop is an open source split keyboard based on the Ferris/Sweep.*
+
+* Keyboard Maintainer: [Jimmerricks](https://github.com/jimmerricks)
+* Hardware Supported: *Swoop MX, Swoop LP + Pro-micro or equivalent*
+* Hardware Availability: [*Swoop Repository*](https://github.com/jimmerricks/swoop)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make bluebell/swoop:default
+
+Flashing example for this keyboard:
+
+    make bluebell/swoop:default:avrdude-split-right
+
+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
+
+Entering the bootloader:
+
+<!-- * **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 small button on the inner side of the PCB - you may have pads you must short instead
+<!-- * **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available -->