Merge pull request #2 from Ruby-SG/dev

Phrase 1: init datatable assets and helper

GOOD TO MERGE!!!
update README
update README
build gem
add bagde gem version
add badge for test coverage
add document badge measure by inch
add comment for class install generator
add circle ci badge
add test
Revert "add test"

This reverts commit 51687e5f733c91c2524f36dd0d4fc1d4a41f529e.
add test coverage to code climate