Add ESLint Linter

[DanielJDufour]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] There are naming inconsistencies between snake case and camel case, i.e. no_data_value versus noDataValue.

Describe the solution you'd like A clear and concise description of what you want to happen. Add in ESLint like we did for GeoRaster: https://github.com/GeoTIFF/georaster/blob/master/package.json#L7

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered. Not sure.

Additional context Add any other context or screenshots about the feature request here.

[DanielJDufour]

done