Create new vertex group from selected vertices(idea by MooKorea #3998 on discord)

sel2VG.py

# NOTE: blender already has this functionality

bl_info = {  
 "name": "Vertex Group From Selected",  
 "author": "Iyad Al-Sonoussi(AKA Human/Redivider/CGOnFire)",  
 "version": (0,1),  
 "blender": (2, 80, 0),  
 "location": "VIEW3D > Vertex Context Menu > New Vertex Group",  
 "description": "Create Vertex Group From Selected Vertices",  
 "warning": "",  
 "wiki_url": "https://gumroad.com/cgonfire",  
 "tracker_url": "",  
 "category": "Mesh"
}

import bpy
from bpy.types import Header, Menu, Panel
from bpy.utils import register_class, unregister_class



class CreateVG(bpy.types.Operator):
    """Create Vertex Group From Selected Vertices"""
    bl_idname = "object.crvg_op"
    bl_label = "New Vertex Group"
    bl_options = {'REGISTER', 'UNDO'}
    @classmethod
    def poll(cls, context):
        return context.active_object is not None

    def execute(self, context):
        obj = bpy.context.active_object
        verts = obj.data.vertices
        group = obj.vertex_groups.new()
        obj.vertex_groups.active = group
        bpy.ops.object.mode_set(mode='OBJECT')
        for v in verts:
            if v.select:
                group.add([v.index],1,'REPLACE')
        bpy.ops.object.mode_set(mode='EDIT')
        return {'FINISHED'}

# This class has to be exactly named like that to insert an entry in the right click menu
class WM_MT_button_context(Menu):
    #bl_options = {'REGISTER'}
    bl_label = "Add Viddyoze Tag"

    def draw(self, context):
        pass

def menu_func(self, context):
    layout = self.layout
    layout.separator()
    layout.operator(CreateVG.bl_idname)
classes = (
    CreateVG,
    WM_MT_button_context,
)
def register():
    for cls in classes:
        register_class(cls)
    bpy.types.VIEW3D_MT_edit_mesh_context_menu.append(menu_func)

def unregister():
    for cls in classes:
        unregister_class(cls)   
    bpy.types.VIEW3D_MT_edit_mesh_context_menu.remove(menu_func)



if __name__ == "__main__":
    register()