study: add study_get_temperature()

study/study.c

@@ -14,4 +14,9 @@ uint8_t study_get_class(void)
 uint8_t study_homework(void)
 {
 	
+}
+
+uint8_t study_get_temperature(void)
+{
+	return check_temperature();
 }

study/study.h

@@ -3,4 +3,5 @@
 void study_set_class(uint8_t class);
 uint8_t study_get_class(void);
 
-uint8_t study_homework(void);
+uint8_t study_homework(void);
+uint8_t study_get_temperature(void);