If you worked for more than 6 months in the USA from Jan to Dec on your first visit to the US, you would pass the substantial presence test. In this case, you would need to show your Indian income and foreign tax paid on your return. I suggest checking with your tax consultant and file. It is better to file using a CPA in your first year to avoid issues. You can file yourself using free tax software online from next year onwards when the income is not mixed between India and the US.