import bpy

class MI_PANEL(bpy.types.Panel):
    bl_label = "Mi Panel"
    bl_idname = "OBJECT_PT_mi_panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = 'Mi Addon'

    def draw(self, context):
        layout = self.layout

def register():
    bpy.utils.register_class(MI_PANEL)

def unregister():
    bpy.utils.unregister_class(MI_PANEL)

if __name__ == "__main__":
    register()