Update

docs_md/components/extended/timer_api.md

@@ -0,0 +1,10 @@
+# Timer Quick API reference
+
+```lua
+timer:init(node, [seconds_from], [seconds_to], [callback])
+timer:on_layout_change()
+timer:set_interval(from, to)
+timer:set_state([is_on])
+timer:set_to(set_to)
+timer:update(dt)
+```