Ignore files Package for VS Code

Adds syntax highlighting to 'ignore' files.

Supported files

.gitignore: references gitignore and Ignoring-Files
.npmignore: works just like a .gitignore references
.dockerignore : works just like a .gitignore references
.coffeelintignore: works just like a .gitignore.
.slugignore: does not support negated ! patterns. Heroku - Slug Compiler
.atomignore: works just like a .gitignore. tree-ignore
.hgignore: references hgignore (currently only glop patterns)
.vscodeignore: works just like a .gitignore references
.eslintignore: works just like a .gitignore references
.prettierignore: works just like a .gitignore references
.stylelintignore: works just like a .gitignore references