[Improvement]add lint

[wreulicke]

This PR aims to add tool for linting. ESLint is lint tool for JavaScript.

add Lint.

Following files is added due to lint :

• ".eslintignore" is a file for Ignoring files from linting.
• ".eslintrc" is setting for linting.

module dependency.

Following files is added due to collect dependencies for linting :

• In package.json , there are dependencies for npm.

usage

If you do not have npm and node, please install npm and node.

lint

you can use a following command for linting.

npm run lint

format

F○cking codes will make you bore. ESlint provides formatting feature. :D you can use a following command for formatting.

npm run format

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Any questions? :D

[wreulicke]

I added ci settings.

[wreulicke]

Sorry, I wroted wrong commands in CI settings. Fixed.

:D