Just adding some headings etc

Added note about code-signed executable.

Added attribution for @s-h-a-d-o-w.

Typo corrected

Fixed line breaks in README usage examples.

Adds a badge showing the number of people helping this repo on CodeTriage.

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Fixes #245.

- Added badges for issue count and repo stars
- Updated screenshots

Removed the link to nvmw project because it is no longer maintained.

Updated readme.md to make sure to remove the existing npm install location

Add a note to make sure the user removes any remaining nodejs installation directories before trying to use nvm-windows. Even running node's uninstaller before installing nvm-windows does not guarantee that this directory will be completely removed, and an nvm-generated symlink will not overwrite an existing installation directory.