MDX VS Code extension
MDX VS Code extension

To add support for many MDX (1) features, syntax highlighting and
bracket matching, the VS Code MDX extension (2) by Matija Marohnić has
been added.

References:
  (1) https://mdxjs.com
  (2) https://marketplace.visualstudio.com/items?itemName=silvenon.mdx

Resolves GH-199

arcticicestudio/igloo,arcticicestudio/igloo,arcticicestudio/igloo