SeulGi Choi(Chase)

Results 3 issues of SeulGi Choi(Chase)

## Motivation Marker has only three events "dragstart", "drag", "dragend". What if you want to get something from marker when it's cliked? You can use `addEventListener` on its element from...

feature :green_apple:
good first issue
api :memo:

remove over-typed semicolon