[Keymap] Adding new Gherkin keymap and configuration with RGB strip (#6252)

keyboards/40percentclub/gherkin/keymaps/michel/config.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#undef RGB_DI_PIN
+#undef RGBLED_NUM
+#define RGB_DI_PIN D3
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 10
+
+/* Make layout upside down = USB port on left side */
+#undef MATRIX_ROW_PINS
+#undef MATRIX_COL_PINS
+#define MATRIX_ROW_PINS { B6, B2, B3, B1, F7 }
+#define MATRIX_COL_PINS { D0, D4, C6, D7, E6, B4 }