Update CONTRIBUTORS.md

[MarthaPinilla]

• [x] I confirm that all the content in this pull request is original work and I am the original author
  • [x] If any content has been taken from other sources I have checked that it is compatible with the license of this repository and I have credited them
• [x] I have nothing that prevents me from submitting this work (like a clause in a work contract)
• [x] Pull request title is prepended with [lang-code]
• [x] I understand that the work I am submitting will be released under the terms of the licence of this repository
  • [x] I have double-checked all of the above and checked the tick-boxes

[darigovresearch]

Thanks, I just added your name to the contributors.md file