[Keyboard] Add Synth Labs Solo keyboard (#16103)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/synthlabs/solo/config.h

@@ -0,0 +1,64 @@
+// Copyright 2022 Aaron Hong (@hongaaronc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define MANUFACTURER    Synth Labs
+#define PRODUCT         Solo
+
+#define ENCODERS 1
+#define ENCODER_RESOLUTION 4
+#define ENCODERS_PAD_A { B2 }
+#define ENCODERS_PAD_B { B3 }
+#define ENCODERS_CW_KEY { { 2, 1 } }
+#define ENCODERS_CCW_KEY { { 0, 1 } }
+
+/* key matrix size */
+#define MATRIX_ROWS 3
+#define MATRIX_COLS 7
+
+#define QMK_KEYS_PER_SCAN 17
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+
+#define FORCE_NKRO
+
+/*
+ * Magic Key Options
+ *
+ * Magic keys are hotkey commands that allow control over firmware functions of
+ * the keyboard. They are best used in combination with the HID Listen program,
+ * found here: https://www.pjrc.com/teensy/hid_listen.html
+ *
+ * The options below allow the magic key functionality to be changed. This is
+ * useful if your keyboard/keypad is missing keys and you want magic key support.
+ *
+ */
+
+#define BOOTMAGIC_LITE_ROW 1
+#define BOOTMAGIC_LITE_COLUMN 1
+
+#define JOYSTICK_BUTTON_COUNT 8
+#define JOYSTICK_AXES_COUNT 1
+#define JOYSTICK_AXES_RESOLUTION 16