[Keyboard] Add Hannah910 (#7234)

* Add new PCB Hannah910

a replace pcb for tgr910 keyboard

* Update readme.md

* update

keyboards/mechlovin/hannah910/hannah910.c

@@ -0,0 +1,61 @@
+/* Copyright 2019 Mechlovin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "hannah910.h"
+
+void matrix_init_kb(void) {
+  matrix_init_user();
+  led_init_ports();
+};
+void led_init_ports(void) {
+  setPinOutput(B2);
+  setPinOutput(D0);
+  setPinOutput(D1);
+  setPinOutput(D2);
+
+}
+void led_set_kb(uint8_t usb_led) {
+  if (IS_LED_ON(usb_led, USB_LED_CAPS_LOCK)) {
+    writePinHigh(B2);
+  } else {
+    writePinLow(B2);
+  }
+      led_set_user(usb_led);
+}
+
+uint32_t layer_state_set_user(uint32_t state)
+{
+  // if on layer 1, turn on D2 LED, otherwise off.
+    if (biton32(state) == 1) {
+        writePinHigh(D2);
+    } else {
+        writePinLow(D2);
+    }
+  // if on layer 2, turn on D1 LED, otherwise off.
+    if (biton32(state) == 2) {
+        writePinHigh(D1);
+    } else {
+        writePinLow(D1);
+    }
+
+  // if on layer 3, turn on D0 LED, otherwise off.
+    if (biton32(state) == 3) {
+        writePinHigh(D0);
+    } else {
+        writePinLow(D0);
+    }
+
+    return state;
+}