Thanks for submitting your entry.
Yes, those above 13 are eligible. In compliance with US laws and policies (as noted in the rules), certain countries are prohibited from entry to the contest. India is not among the restricted countries. So there is no eligibility issue with your submission.
We are not looking for source code. However, if you would like to provide supporting material in form of flowcharts, detailed write up, pseudo-code, or even source code to make your idea more concrete and bolster your entry, you are welcome to do so.
Let us know if you have more questions.
Modified on Sept. 16, 2020, 8:04 a.m. PDT