Add qmk_firmware submodule and own config

README.md

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+# Keyboard Firmware
+
+This repository contains the firmware for the `keyboardeeroy_jenkins` keyboard.
+
+## Build and flash
+
+1. Init submodules and build firmware
+    ```bash
+    $ git submodule update --init
+    $ ./build.sh
+    ```
+2. Back up current firmware (optional)
+    ```bash
+    $ picotool save --all left.bin  # Left half
+    $ picotool save --all right.bin  # Right half
+    ```
+3. Flash both keyboard halves
+    ```bash
+    $ picotool load qmk_firmware/keyboardeeroy_jenkins_default.uf2  # Both halves
+    ```