add keys,keyboard actions for mini keyboard

Code/devterm_keyboard_mini/devterm.h

@@ -18,6 +18,8 @@ typedef struct keyboard_state{
   uint8_t prev_layer;
   uint8_t fn_on;
   uint8_t shift;
+  uint8_t backlight;//0 1 2 3
+  uint8_t lock;//0 1
   
 }KEYBOARD_STATE;
 
@@ -38,5 +40,6 @@ class DEVTERM {
 };
 
 #define KEYBOARD_PULL 1 // 1 for PULLUP, 0 FOR PULLDOWN
+#define KEYBOARD_LED_PWM_PERIOD 200
 
 #endif