add anthill ui and bying units

scripts/ui/following_ui.gd

@@ -0,0 +1,26 @@
+extends Control
+class_name FollowingUi
+
+var target: Node3D
+
+@onready var camera: Camera3D = get_viewport().get_camera_3d()
+
+func _ready() -> void:
+	visible = false
+
+
+func _process(_delta: float) -> void:
+	if not visible or target == null:
+		return
+
+	var pos := camera.unproject_position(target.global_position)
+	position = pos
+
+
+func set_target(to: Node3D)->void:
+	visible = true
+	target = to
+
+func close() -> void:
+	visible = true
+	target = null