Xbox allows you to add your friends to your profile so you can play with them. This is an excellent feature to stay in contact with people in different parts of the world.
The following steps will show you how you can add your friends using the Xbox app:
Ask your friend for his Xbox live Gamertag
Launch the Xbox console companion app
In the find, people or clubs search bar, enter your friend's Gamertag and click search. Be careful while dealing with Gamertags since they are case sensitive
Select Add friend to add the person to your game list
To help your friend recognize you, you can share your real name with him.
Select OK to finish.
You can choose what kind of information you want to share with your friend.
You can do so by choosing Friend or Favourite