title: Implementing ADD friends feture in flutter app like in instagram, snapchat, faceboook
body: <p>i am currently working on a flutter app which is kinda social media app, right now i am stuck with the idea to implement the add friends feature from a list of contacts who have account in my app, but i can not think of any method of doing so , my app's back-end is handled by <code>Firebase</code> with each user's profile information stored differently in <code>Firestore</code> database,</p>
  <p>i want a simple and efficient way to add friends in my app, more like Facebook, Instagram, Snapchat,</p>
  <p>can anyone suggest me how to implement this feature in my app?</p>
  <p>if so please provide links to pages and documentations!</p>
  <p>Thank you</p>