Add reporting form for events to enable event tracking

[amakarudze]

For now, organizers are only required to provide statistics. There is need to add a form which will answer a few questions to enable Django Girls to track event success for sponsors.

[Nandika-A]

Hello @amakarudze! Congratulations on ten years of Django girls! Can you share more specifications about this issue, like what needs to be asked in the form? I want to work on this.