Workout more. It's fun it will help you be more confident and alpha mens
But if you will take the weaklings way then yeah just eat more
have a set schedule and eat big meals would be my bet
Calculate your base metabolic rate (BMR), that is the amount of calories your body needs to survive and maintain your weight. There are calculators online.
Add 20% to that number and get that many calories per day. Focus on protein, then fats.
I went from 155lbs to 215 using this method. I lift 5 times per week and I am very strict with my diet. Good luck man!
that really isn't skinny, I think 80 might be too much unless you plan to build a little of muscle, but then again I don't know how you wear your weight so I guess to answer you question it would be 'eat food'