MapActivity Styling

[SHEELE41]

• Map style (Light) - https://developers.google.com/maps/documentation/android-sdk/map-with-marker?hl=ko
• Custom marker - https://all-dev-kang.tistory.com/entry/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-%EA%B5%AC%EA%B8%80%EB%A7%B5-%EC%BB%A4%EC%8A%A4%ED%85%80-%EB%A7%88%EC%BB%A4%EB%A5%BC-%ED%95%98%EB%8A%94-2%EA%B0%80%EC%A7%80-%EB%B0%A9%EB%B2%95