Adding Custom Shader Node

Building Blender
1

I want to add a new node to the shader editor. my build environment is ready and updated:
Windows 64 Bit
Cmake
VSCode
Visual Studio 2022 installed
Python 3 installed
This are stpest that I did to add the shader:
D:\WIP\Test_018_Blender\blender\source\blender\nodes\shader\nodes\node_shader_mehdi.cc

#include "node_shader_util.hh"
#include "node_shader_register.hh"

namespace blender::nodes::node_shader_mehdi_cc
{
static void node_declare(NodeDeclarationBuilder &b)
{
    b.add_input<decl::Shader>("In");
    b.add_output<decl::Shader>("Out");
}

static int gpu_shader_mehdi(GPUMaterial *mat,
                            bNode *node,
                            bNodeExecData *,
                            GPUNodeStack *in,
                            GPUNodeStack *out)
{
    return GPU_stack_link(mat, node, "node_mehdi", in, out);
}
}

void register_node_type_sh_mehdi()
{
    namespace file_ns = blender::nodes::node_shader_mehdi_cc;

    static blender::bke::bNodeType ntype;
    sh_node_type_base(&ntype, "ShaderNodeMehdi", SH_NODE_MEHDI);
    ntype.ui_name = "Mehdi";
    ntype.ui_description = "Minimal pass-through example.";
    ntype.nclass = NODE_CLASS_SHADER;
    ntype.add_ui_poll = object_shader_nodes_poll;
    ntype.declare = file_ns::node_declare;
    ntype.gpu_fn = file_ns::gpu_shader_mehdi;
    blender::bke::node_register_type(ntype);
}

D:\WIP\Test_018_Blender\blender\source\blender\nodes\shader\CMakeLists.txt

set(SRC
  nodes/node_shader_mehdi.cc

D:\WIP\Test_018_Blender\blender\source\blender\nodes\shader\node_shader_register.cc

register_node_type_sh_mehdi();

D:\WIP\Test_018_Blender\blender\source\blender\nodes\shader\node_shader_register.hh

void register_node_type_sh_mehdi();

D:\WIP\Test_018_Blender\blender\source\blender\gpu\shaders\material\gpu_shader_material_mehdi.glsl

/* SPDX-FileCopyrightText: 2019 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

void node_mehdi(float val, float width, float center, out float outval)
{
  outval = 1.0 / (1.0 + pow(2.71828183, -((val - center) * width)));
}

D:\WIP\Test_018_Blender\blender\source\blender\gpu\CMakeLists.txt

shaders/material/gpu_shader_material_mehdi.glsl

and then build/make the entire project, but when I open Blender, shader node is not created.

In general what is the correct pipeline to add a shader node in Blender?
The functionality of the node is, it hasa shader socket input and will output metallic as rgb.