bl_info = {
    "name": "Hello World Addon",
    "author": "BacklogEngine",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "View3D > Sidebar > Hello World",
    "description": "Adds a button that prints Hello World",
    "category": "Development",
}

import bpy

class HELLO_OT_print_hello_world(bpy.types.Operator):
    """Print Hello World to console"""
    bl_idname = "hello.print_hello_world"
    bl_label = "Print Hello World"

    def execute(self, context):
        print("Hello World")
        self.report({'INFO'}, "Hello World printed to console!")
        return {'FINISHED'}

class HELLO_PT_main_panel(bpy.types.Panel):
    """Creates a Panel in the 3D Viewport N-Panel"""
    bl_label = "Hello World"
    bl_idname = "HELLO_PT_main_panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Hello World"

    def draw(self, context):
        layout = self.layout
        layout.operator("hello.print_hello_world")

classes = (
    HELLO_OT_print_hello_world,
    HELLO_PT_main_panel,
)

def register():
    for cls in classes:
        bpy.utils.register_class(cls)

def unregister():
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)

if __name__ == "__main__":
    register()