i need exercies at home?

guys i need your help :), i am very thin, i want to gain weight, i love eating but i cant gain kgs, i am 18 years old and 53kg, so i heard that if i do exercises it would be good, and also i want to have nice body, i dont have enough time to go at gym, i need exercises at home , if anybody knows good exercises which i can do at home pls tell