fix: Actually add the zmk-usb-logging snippet.

* D'oh.

app/snippets/zmk-usb-logging/README.rst

@@ -0,0 +1,36 @@
+.. _snippet-cdc-acm-console:
+
+CDC-ACM Console Snippet (cdc-acm-console)
+#########################################
+
+.. code-block:: console
+
+   west build -S cdc-acm-console [...]
+
+Overview
+********
+
+This snippet redirects serial console output to a CDC ACM UART. The USB device
+which should be used is configured using :ref:`devicetree`.
+
+Requirements
+************
+
+Hardware support for:
+
+- :kconfig:option:`CONFIG_USB_DEVICE_STACK`
+- :kconfig:option:`CONFIG_SERIAL`
+- :kconfig:option:`CONFIG_CONSOLE`
+- :kconfig:option:`CONFIG_UART_CONSOLE`
+- :kconfig:option:`CONFIG_UART_LINE_CTRL`
+
+A devicetree node with node label ``zephyr_udc0`` that points to an enabled USB
+device node with driver support. This should look roughly like this in
+:ref:`your devicetree <get-devicetree-outputs>`:
+
+.. code-block:: DTS
+
+   zephyr_udc0: usbd@deadbeef {
+    compatible = "vnd,usb-device";
+        /* ... */
+   };

app/snippets/zmk-usb-logging/snippet.yml

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+name: zmk-usb-logging
+append:
+  EXTRA_CONF_FILE: zmk-usb-logging.conf
+  EXTRA_DTC_OVERLAY_FILE: zmk-usb-logging.overlay

app/snippets/zmk-usb-logging/zmk-usb-logging.conf

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+CONFIG_ZMK_USB_LOGGING=y
+

app/snippets/zmk-usb-logging/zmk-usb-logging.overlay

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+/*
+ * Copyright (c) 2024 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/ {
+    chosen {
+        zephyr,console = &snippet_zmk_usb_logging_uart;
+        zephyr,shell-uart = &snippet_zmk_usb_logging_uart;
+    };
+};
+
+&zephyr_udc0 {
+    snippet_zmk_usb_logging_uart: snippet_zmk_usb_logging_uart {
+        compatible = "zephyr,cdc-acm-uart";
+    };
+};