Include nodejs seed with connection to postgres, docs improvements.

[dimeloper]

Title

Include nodejs seed with connection to postgres, docs improvements

Description

• Includes a new nodejs seed that offers connectivity to postgres databases
• Introduces a new section in README files to offer a better overview in regards to environment variables
• Last but not least, it introduces eslint, to enforce coding style across all nodejs seeds

Related Issues

[List any related issues or pull requests that this pull request addresses]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Screenshots (if applicable)

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Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have tested my changes thoroughly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Please add an x inside the square brackets to check off each item in the checklist.

Additional Notes (if applicable)

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