Hello Nikunj,

Py File:-

class custom_class(models.Model):

     _name = 'custom.class'

     name = fields.Char('Name')

XML file :-

<?xml version="1.0" encoding="utf-8"?>

<odoo> 

     <record id="custom_class_form_view" model="ir.ui.view">

         <field name="name">custom.class.form.view</field>

        <field name="model">custom.class</field>

         <field name="arch" type="xml">

             <form>

                 <sheet>

                     <group>

                         <field name="name"/>

                     </group>

                 </sheet>

             </form>

         </field>

     </record>

    <record id="custom_class_tree_view" model="ir.ui.view">

         <field name="name">custom.class.treeview</field>

        <field name="model">custom.class</field>

         <field name="arch" type="xml">

             <tree>

                 <field name="name"/>

             </tree>

         </field>

     </record>

    <record id="action_custom_class" model="ir.actions.act_window">

        <field name="name">Custom Class</field>

        <field name="res_model">custom.class</field>

        <field name="view_type">form</field>

        <field name="view_mode">tree,form</field>

    </record>

    <menuitem name="Custom Class" id="custom_class_menu" action="action_custom_class"/>

</odoo>

Hope it works for you.

Thanks,