Add very basic, untested, Sofle configuration.

app/boards/shields/sofle/Kconfig.defconfig

@@ -0,0 +1,54 @@
+
+if SHIELD_SOFLE_LEFT
+
+config ZMK_KEYBOARD_NAME
+	default "Sofle Left"
+
+endif
+
+if SHIELD_SOFLE_RIGHT
+
+config ZMK_KEYBOARD_NAME
+	default "Sofle Right"
+
+endif
+
+if SHIELD_SOFLE_LEFT || SHIELD_SOFLE_RIGHT
+
+if ZMK_DISPLAY
+
+config I2C
+	default y
+
+config SSD1306
+	default y
+
+config SSD1306_REVERSE_MODE
+	default y
+
+endif # ZMK_DISPLAY
+
+if LVGL
+
+config LVGL_HOR_RES
+	default 128
+
+config LVGL_VER_RES
+	default 32
+
+config LVGL_VDB_SIZE
+	default 64
+
+config LVGL_DPI
+	default 148
+
+config LVGL_BITS_PER_PIXEL
+	default 1
+
+choice LVGL_COLOR_DEPTH
+	default LVGL_COLOR_DEPTH_1
+endchoice
+
+endif # LVGL
+
+endif