Merge branch 'release/0.0.69' into develop
src: add instance method 'topLeftCorner()'
test: add instance method 'topLeftCorner()' testings
lint: add some files for linting pass
readme: add instance method 'topLefCorner()' api

fix a mistake
npm: 0.0.69 -> 0.0.70
Merge branch 'release/0.0.70'