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According to your height and weight , Body Mass Index(BMI) is 16.4,which is slighlty underweight, where as the normal BMI range is from 18.5-24.9.Ideal body weight for your height should be from 72kg - 79kg .To increase your weight, diet should be high in protein which helps to increase the muscle mass and stamina in the body. Eating foods rich in protein includes whole pulses, legumes, milk products, soya products, peanut butter, nuts and dry fruits.Take foods like fruit milkshakes,dry fruit milkshakes, lassi, buttermilk, whole milk,Flavoured soy milk,tofu (soy paneer),groundnut chikki/ burfi, green banana and you can try using protein supplements which should be taken along with the diet.Weight gain is a slow process and it can be acheived by sustitutiting foods high in calories and fats like oily fried foods, junk foods, highly saturated sweets, carbonated drinks with protein rich foods like fruit milkshakes, chicken / tuna sandwich,boiled pulses like rajma, chole,paneer tikka, tofu sandwiches,dry fruit milkshakes, lassi, buttermilk, whole milk,soy flavoured milk, groundnut chikki/ burfi and peanut butter.