To gain your lean muscle mass, eat a diet rich in protein, moderate amount of carbohydrates and low in fats.
Difficult to explain exact diet on this chat
But as per your diet details, instead of bread for breakfast, eat multigrain chapatti with boiled egg, milk
Lunch should be brown rice,dal, vegetables,salads,boiled sprouts,curds
Evening- fresh fruit,nuts,seeds,milk
Dinner - same as lunch
30 gramsWhey protein after your weight training session
Next Steps
get your body composition analysed
Health Tips
consult a qualified Dietician for a personal diet chart as per your age, activity levels and other parameters