if you want to get the friends list you can put this code into your MainMenuOverride.res inside the ui folder
"FriendsContainer"
{
"ControlName" "EditablePanel"
"fieldname" "FriendsContainer"
"xpos" "r107"
"ypos" "200"
"zpos" "11"
"wide" "106"
"tall" "220"
"visible" "1"
"bgcolor_override" "0 0 0 50"
"SteamFriendsList"
{
"ControlName" "CSteamFriendsListPanel"
"fieldname" "SteamFriendsList"
"xpos" "3"
"ypos" "3"
"zpos" "500"
"wide" "106"
"tall" "214"
"visible" "1"
"proportionaltoparent" "1"
"columns_count" "1"
"inset_x" "0"
"inset_y" "0"
"row_gap" "2"
"column_gap" "0"
"restrict_width" "0"
"friendpanel_kv"
{
"wide" "100"
"tall" "20"
}
"ScrollBar"
{
"ControlName" "ScrollBar"
"FieldName" "ScrollBar"
"wide" "0"
}
}
}
taken from m0rehud