add code

.gitignore

@@ -0,0 +1,13 @@
+# Binaries.
+bin/
+
+# Objects.
+*.os
+
+# SConstruct
+.sconf_temp
+.sconsign.dblite
+*.pyc
+
+# MacOS
+.DS_Store/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "godot-cpp"]
+	path = godot-cpp
+	url = https://github.com/godotengine/godot-cpp.git

SConstruct

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+#!/usr/bin/env python
+import os
+import sys
+
+env = SConscript("godot-cpp/SConstruct")
+
+env.Append(CPPPATH=["src/"])
+sources = Glob("src/*.cpp")
+
+if env["platform"] == "osx":
+    library = env.SharedLibrary(
+        "bin/libgdexample.{}.{}.framework/libgdexample.{}.{}".format(
+            env["platform"], env["target"], env["platform"], env["target"]
+        ),
+        source=sources,
+    )
+else:
+    library = env.SharedLibrary(
+        "bin/libgdexample.{}.{}.{}{}".format(
+            env["platform"], env["target"], env["arch_suffix"], env["SHLIBSUFFIX"]
+        ),
+        source=sources,
+    )
+
+Default(library)

godot-cpp

@@ -0,0 +1 @@
+Subproject commit 8dbaf5a7ff0b75222948d9e53633f584499f12bf

src/example.cpp

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+#include "example.hpp"
+
+#include <godot_cpp/core/class_db.hpp>
+
+#include <godot_cpp/classes/global_constants.hpp>
+#include <godot_cpp/classes/label.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
+
+using namespace godot;
+
+void Example::_bind_methods()
+{
+	ClassDB::bind_method(D_METHOD("hello_extension"), &Example::hello_extension);
+}
+
+Example::Example()
+{
+}
+
+Example::~Example()
+{
+}
+
+void Example::hello_extension()
+{
+	UtilityFunctions::print("Hello GDExtension!");
+}

src/example.hpp

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+#pragma once
+
+#include <godot_cpp/classes/node.hpp>
+#include <godot_cpp/classes/global_constants.hpp>
+#include <godot_cpp/classes/viewport.hpp>
+
+#include <godot_cpp/core/binder_common.hpp>
+
+using namespace godot;
+
+class Example : public Node
+{
+	GDCLASS(Example, Node);
+
+protected:
+	static void _bind_methods();
+
+public:
+	Example();
+	~Example();
+
+	void hello_extension();
+};

src/register_types.cpp

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+#include "register_types.h"
+
+#include <godot/gdnative_interface.h>
+
+#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/core/defs.hpp>
+#include <godot_cpp/godot.hpp>
+
+#include "example.hpp"
+
+using namespace godot;
+
+void initialize_example_module(ModuleInitializationLevel p_level)
+{
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE)
+	{
+		return;
+	}
+
+	ClassDB::register_class<Example>();
+}
+
+void uninitialize_example_module(ModuleInitializationLevel p_level)
+{
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE)
+	{
+		return;
+	}
+}

src/register_types.h

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+#pragma once
+
+#include <godot_cpp/core/class_db.hpp>
+using namespace godot;
+
+void initialize_example_module(ModuleInitializationLevel p_level);
+void uninitialize_example_module(ModuleInitializationLevel p_level);