Unity : How can i procedural generate geometry, create object, attach material to it? (example)

CreateQuard.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CreateQuard : MonoBehaviour
{
    public Material material;

    // Start is called before the first frame update
    void Start()
    {
        Create();
    }

    void Create()
    {
        Mesh mesh = new Mesh();
        mesh.name = "Name of created new Mesh";

        Vector3[] vertices = new Vector3[4];
        Vector3[] normals = new Vector3[4];
        Vector2[] uvs = new Vector2[4];
        int[] trinagles = new int[6];

        //all posibile UVs
        Vector2 uv00 = new Vector2(0f, 0f);
        Vector2 uv01 = new Vector2(0f, 1f);
        Vector2 uv10 = new Vector2(1f, 0f);
        Vector2 uv11 = new Vector2(1f, 1f);

        //all posibile vertices (of the cube!)
        Vector3 p0 = new Vector3(-0.5f, -0.5f,  0.5f);
        Vector3 p1 = new Vector3( 0.5f, -0.5f,  0.5f);
        Vector3 p2 = new Vector3( 0.5f, -0.5f, -0.5f);
        Vector3 p3 = new Vector3(-0.5f, -0.5f, -0.5f);
        Vector3 p4 = new Vector3(-0.5f,  0.5f,  0.5f);
        Vector3 p5 = new Vector3( 0.5f,  0.5f,  0.5f);
        Vector3 p6 = new Vector3( 0.5f,  0.5f, -0.5f);
        Vector3 p7 = new Vector3(-0.5f,  0.5f, -0.5f);

        vertices = new Vector3[] { p4, p5, p1, p0 };
        normals = new Vector3[] { Vector3.forward, Vector3.forward, Vector3.forward, Vector3.forward };
        uvs = new Vector2[] { uv11, uv01, uv00, uv10 };
        trinagles = new int[] { 3, 1, 0, 3, 2, 1 };

        mesh.vertices = vertices;
        mesh.normals = normals;
        mesh.uv = uvs;
        mesh.triangles = trinagles;

        //Calculate the bounding box that encompasses the mesh,
        //it's used for rendering if you has wrong bounding box
        //it may or not get ocluded or not when it needs to be
        //so it's a good idea to always do this when you are playing with meshes
        mesh.RecalculateBounds();

        GameObject quard = new GameObject("quard");
        quard.transform.parent = this.gameObject.transform;
        MeshFilter meshFilter = (MeshFilter)quard.AddComponent(typeof(MeshFilter));
        meshFilter.mesh = mesh;
        MeshRenderer renderer = quard.AddComponent(typeof(MeshRenderer)) as MeshRenderer;
        renderer.material = material;
    }
}