Add linting strategy

[tschaffter]

• Fixes #359

Features

• Document project style guide in docs/style-guide.md.
• Use husky to trigger the linter when creating a commit.
• Use lint-staged to to lint only the files that have been staged before creating a new commit.
• This project runs prettier via eslint for additional flexibility in validating files.
• Add VS Code workspace settings to automatically fix lint issues (.vscode/settings.json).
• The new configuration file .eslintrc.json is a combination of the exsiting file generated when this Angular project was created and the config file I created for https://github.com/Sage-Bionetworks/rocc-db-client.
• Comment out all unit tests for the sake of simplicity and because jest is now preferred to karma-jasmin for unit tests.

References

• https://medium.com/@jakubsynowiec/you-should-always-quote-your-globs-in-npm-scripts-621887a2a784
• https://github.com/google/gts

[tschaffter]

Eslint error related to angular inline template

• [x] Fixes eslint error Occurred while linting /home/tschaffter/dev2/sage-bionetworks/rocc/rocc-app/src/app/shared/filters/filter.component.ts/1_inline-template-1.component.html:0
  • Solution: https://github.com/angular-eslint/angular-eslint/issues/105

[tschaffter]

@vpchung Here is how I asked Rong to test this PR offline:

1. Checkout this branch
2. Try to "break" the style of a .ts file, e.g. by adding multiple new lines between two functions, then save the file. The linter should automatically fix the format of the file before saving. If not, try reloading the project in VS Code.