groups.xml

<odoo>
    <data noupdate="0">
        <!-- Category -->
        <record id="module_category_redner" model="ir.module.category">
            <field name="name">Redner</field>
            <field name="sequence">10</field>
        </record>

        <!-- User Group -->
        <record id="group_redner_user" model="res.groups">
            <field name="name">Redner User</field>
            <field name="category_id" ref="module_category_redner" />
            <field name="implied_ids" eval="[(4, ref('base.group_user'))]" />
        </record>

        <!-- Admin Group -->
        <record id="group_redner_admin" model="res.groups">
            <field name="name">Redner Administrator</field>
            <field name="category_id" ref="module_category_redner" />
            <field name="implied_ids" eval="[(4, ref('base.group_user'))]" />
        </record>
    </data>
</odoo>