STEP 1

First we start with JS Code

/** @odoo-module */

import { useService } from "@web/core/utils/hooks";
import { ListController } from "@web/views/list/list_controller";

export class ButtonNearCreateButtonController extends ListController {
	setup() {
		super.setup();
		this.orm = useService("orm");
	}

	async onCreateProject() {
		let project_data = { name : 'Test'};
		// Both way will create project
		await this.orm.call('project.project', 'action_create_project', [project_data], {}); // this one call a python method that we define in the project model
		await this.orm.create("project.project", [project_data], {}); // this one call the ORM create method that Odoo already define for us
		await this.model.root.load();
		this.model.notify();
	}

}

STEP 2

View inheritance to add button near create button

Create a xml file , you can name whatever you like, and the xml need to be like this

&lttemplates id="template" xml:space="preserve">

	&ltt t-name="d_button_near_create_button.ButtonNearCreateButtonView.Buttons" t-inherit="web.ListView.Buttons" t-inherit-mode="primary" owl="1">
		&ltxpath expr="//t[@t-if='props.showButtons']" position="after">
			&ltbutton type="button" t-on-click="onCreateProject" class="btn btn-primary">
				Create project here as well
			&lt/button>
		&lt/xpath>
	&lt/t>

&lt/templates>
		

STEP 3

Register using registry in order to tell Odoo to recognize our code

/** @odoo-module */

import { listView } from "@web/views/list/list_view";
import { registry } from "@web/core/registry";
import { ButtonNearCreateButtonController as Controller } from './button_near_create_button_controller';

export const ButtonNearCreateButtonView = {
    ...listView,
    Controller,
    buttonTemplate: 'd_button_near_create_button.ButtonNearCreateButtonView.Buttons',
};

registry.category("views").add("button_near_create_button", ButtonNearCreateButtonView);
		

STEP 4

And most importantly is to remember to define js code in manifest. And you good to go

'assets': {
        'web.assets_backend': [
            '/d_button_near_create_button/static/src/views/*/*',
        ],
    },