[Add] VSCode to code editors, grammar enhancements

[lovettbp]

• Capitalize the H in GitHub
• Add Visual Studio Code by Microsoft to the code editors category. It's like Atom, but 10x faster. https://github.com/Microsoft/vscode

[n1trux]

My repo already has it: https://github.com/n1trux/awesome-sysadmin#editors

[kahun]

Thanks