add Dart to Health

[dmaldonadol]

Thank you for taking the time to work on a PR for Awesome-Artificial-Intelligence-Chile!

To ensure your PR is dealt with swiftly please check the following:

• Submit one item per pull request. This eases reviewing and speeds up inclusion.
• Additions are inserted preserving alphabetical order.
• Any category you are creating has the minimum requirement of 3 items.
  If not, your addition may be inserted into Misc/Other.
• Any software project you are adding to the list is actively maintained.
• The pull request title is informative, unlike "Update README.md".
  Suggested titles: "Add aaa to bbb" for adding item aaa to section bbb,
  "Remove aaa from bbb" for removing, "Fix link for aaa", etc.