Add firmware for CozyKeys Bloomer keyboard (#12639)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Erovia <Erovia@users.noreply.github.com>

keyboards/cozykeys/bloomer/readme.md

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+# Bloomer
+
+![Bloomer](http://assets.cozykeys.xyz/images/keyboards/bloomer/bloomer-angle-2_800x800.jpg)
+
+- Keyboard Maintainer: [Paul Ewing](https://github.com/pcewing)
+- Hardware Supported: ItsyBitsy 32u4 5V 16MHz
+- Hardware Availability: [Bloomer Repository](https://github.com/cozykeys/bloomer)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make cozykeys/bloomer/v2:default  # for Bloomer v2
+    make cozykeys/bloomer/v3:default  # for Bloomer v3
+
+Flashing example for this keyboard:
+
+    make cozykeys/bloomer/v2:default:flash  # for Bloomer v2
+    make cozykeys/bloomer/v3:default:flash  # for Bloomer v3
+
+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).
+
+## Flashing the Firmware
+
+See the QMK docs for handwiring a keyboard; there is a section with instructions on how to flash the *.hex* file to the Teensy 2.0 controller.