I'm not Indian, so I don't have details for you. However, there is an Indian community here doing business -I think it is quite small but growing. I have talked to some Indians who have been here for many years and like it. Rwanda is a good place to do business and safe to live at the present time. There are a couple of Indian restaurants and small shops... also telecommunications (I believe Airtel is Indian owned) and probably several other industries including IT, fabrics, and clothing. There are many food and spice products imported from India as well as household items... for example, my toothpaste, water filter, and a thermal serving pot. Besides local countries like Kenya, Tanzania, and Uganda... major imports come from China, of course, Korea (electronics and appliances), Turkey, and a few things from the UK... also sometimes Dubai and Egypt for furniture and appliances. I'm not knowledgeable on this topic, but this is my observation when shopping in the main markets, small shops, and fancy stores.
Why don't you try contacting the owners of one of the restaurants below... maybe they can answer your questions or put you in touch with other Indians doing business here. Good luck.
Zaaffran Indian Restaurant
3 KN 16 Ave, Kigali, Rwanda
Phone: +250 783 042 504
Khana Khazana
9 KN 31 St, Kigali, Rwanda
Phone: +250 788 499 600