Add copyright to source files in simple_shader and simple_sdf

simple_sdf/lib/main.dart

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 import 'dart:ui' as ui;
 
 import 'package:flutter/material.dart';

simple_sdf/shaders/SDF.frag

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 #version 460 core
 
 #include <flutter/runtime_effect.glsl>

simple_sdf/test/widget_test.dart

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 import 'package:flutter_test/flutter_test.dart';
 import 'package:simple_sdf/main.dart';
 

simple_shader/lib/main.dart

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 import 'dart:ui' as ui;
 
 import 'package:flutter/material.dart';

simple_shader/shaders/simple.frag

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 #version 460 core
 
 #include <flutter/runtime_effect.glsl>

simple_shader/test/widget_test.dart

@@ -1,3 +1,7 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 import 'package:flutter_test/flutter_test.dart';
 import 'package:simple_shader/main.dart';