Since this is a PM StackExchange, I'll try to answer it in a way that I'd help a PM. Your thesis is a project, after all.
Your main stakeholder is your professor. You will no doubt have other stakeholders - a review board, perhaps - who have their own preferences. Have you asked them what a top-marked report looks like, and what they valued in it? If not, perhaps you have a chance to do so before it's due.
The university probably has a stake too - they will want anyone who graduates from them to be a good representation of their university. How can you help them with that? Can you show evidence that the resources, teaching and support that they've provided you have helped? If they didn't, can you suggest what you would have liked or done differently yourself next time?
The main purpose of a Gantt chart is to identify major milestones and to give a rough outline of a project at the start, before the real risks, difficulties and pleasant surprises have been discovered. What did you discover along the way, and will it be of interest to your professors? Do you have any comparisons between the original Gantt chart and the real project timeline? Will they be interested in the learning?
Will a professional, high-level manager outside of the university be more impressed by someone who can show evidence of good computer programming, or someone who can show evidence that they've understood their stakeholders' need and vision, and delivered accordingly? How can you do that best?
When you can answer these questions, I think you'll understand where to put your Gantt chart.