adding micropython examples (#2286)

* adding micropython examples

* adding micropython examples

examples/widgets/calendar/lv_example_calendar_1.py

@@ -0,0 +1,42 @@
+def event_handler(evt):
+    code = evt.get_code()
+
+    if code == lv.EVENT.VALUE_CHANGED:
+        source = lv.calendar.__cast__(evt.get_target())
+        date = lv.calendar_date_t()
+        lv.calendar.get_pressed_date(source,date)
+        if date:
+             print("Clicked date: %02d.%02d.%02d"%(date.day, date.month, date.year))
+                
+
+calendar = lv.calendar(lv.scr_act())
+calendar.set_size(200, 200)
+calendar.align(lv.ALIGN.CENTER, 0, 20)
+calendar.add_event_cb(event_handler, lv.EVENT.ALL, None)
+
+calendar.set_today_date(2021, 02, 23)
+calendar.set_showed_date(2021, 02)
+
+# Highlight a few days
+highlighted_days=[]
+for i in range(3):
+    highlighted_days.append(lv.calendar_date_t())
+
+highlighted_days[0].year=2021
+highlighted_days[0].month=02
+highlighted_days[0].day=6
+
+highlighted_days[1].year=2021
+highlighted_days[1].month=02
+highlighted_days[1].day=11
+
+highlighted_days[2].year=2022
+highlighted_days[2].month=02
+highlighted_days[2].day=22
+
+calendar.set_highlighted_dates(highlighted_days, 3)
+
+header = lv.calendar_header_dropdown(lv.scr_act(),calendar)
+# header = lv.calendar_header_arrow(lv.scr_act(),calendar,25)
+
+