[Keyboard] Add ERA65 (#19591)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/era/era65/readme.md

@@ -0,0 +1,25 @@
+# ERA65
+
+ERA65 Keyboard
+
+* Keyboard Maintainer: [ERA](https://github.com/eerraa)
+* Hardware Supported: RP2040
+* Hardware Availability: [ERA](https://github.com/eerraa)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make era/era65:default
+
+Flashing example for this keyboard:
+
+    make era/era65:default:flash
+
+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
+
+Enter the bootloader in 3 ways:
+
+* **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**: Short the reset hole of the PCB twice within 1 second.
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available