lets all be friendly! (#809)

* lets all be friendly!

* fix doc

* Update ClientUser.js

* Update ClientUser.js

src/structures/ClientUser.js

@@ -126,6 +126,28 @@ class ClientUser extends User {
     return this.setPresence({ afk });
   }
 
+  /**
+   * Send a friend request
+   * <warn>This is only available for user accounts, not bot accounts!</warn>
+   * @param {UserResolvable} user The user to send the friend request to.
+   * @returns {Promise<User>} The user the friend request was sent to.
+   */
+  addFriend(user) {
+    user = this.client.resolver.resolveUser(user);
+    return this.client.rest.methods.addFriend(user);
+  }
+
+  /**
+   * Remove a friend
+   * <warn>This is only available for user accounts, not bot accounts!</warn>
+   * @param {UserResolvable} user The user to remove from your friends
+   * @returns {Promise<User>} The user that was removed
+   */
+  removeFriend(user) {
+    user = this.client.resolver.resolveUser(user);
+    return this.client.rest.methods.removeFriend(user);
+  }
+
   /**
    * Set the full presence of the current user.
    * @param {Object} data the data to provide