Add NotifyIcon example

examples/notifyicon/.gitignore

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+.dub
+docs.json
+__dummy.html
+docs/
+/hello_dfl
+hello_dfl.so
+hello_dfl.dylib
+hello_dfl.dll
+hello_dfl.a
+hello_dfl.lib
+hello_dfl-test-*
+*.exe
+*.pdb
+*.o
+*.obj
+*.lst

examples/notifyicon/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "C++ Launch (Windows) notifyicon",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "cwd": "${workspaceRoot}",
+            "program": "./bin/notifyicon_sample.exe",
+            "console": "internalConsole"
+        }
+    ]
+}

examples/notifyicon/.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "dub",
+			"run": false,
+			"cwd": ".",
+			"compiler": "$current",
+			"archType": "$current",
+			"buildType": "$current",
+			"configuration": "$current",
+			"problemMatcher": [
+				"$dmd"
+			],
+			"group": "build",
+			"label": "dub: Build notifyicon_sample",
+			"detail": "dub build --compiler=dmd.EXE -a=x86_64 -b=debug -c=application"
+		}
+	]
+}

examples/notifyicon/README.md

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+# Screen Shot
+![screen shot](./image/screenshot.png "screen shot")

examples/notifyicon/dub.json

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+{
+	"authors": ["haru-s"],
+	"copyright": "Copyright (C) 2023 haru-s",
+	"description": "DFL sample code.",
+	"name": "notifyicon_sample",
+	"targetType": "executable",
+	"targetPath": "bin",
+	"dependencies": {
+		"dfl": {
+			"path": "../../../dfl"
+		}
+	},
+	"lflags-windows-x86_omf-dmd":    ["/exet:nt/su:windows:6.0"],
+	"lflags-windows-x86_mscoff-dmd": ["/SUBSYSTEM:WINDOWS", "/ENTRY:mainCRTStartup"],
+	"lflags-windows-x86_64-dmd":     ["/SUBSYSTEM:WINDOWS", "/ENTRY:mainCRTStartup"]
+}

examples/notifyicon/notifyicon.code-workspace

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+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"d.projectImportPaths": [
+			"..\\..\\..\\dfl\\source"
+		]
+	}
+}

examples/notifyicon/shell.bat

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+set dmd_path=c:\d\dmd2\windows
+set dmc_path=c:\dmc\dm
+cmd

examples/notifyicon/source/notifyicon_sample.d

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+import dfl;
+
+version(Have_dfl) // For DUB.
+{
+}
+else
+{
+	pragma(lib, "dfl.lib");
+}
+
+class MainForm : Form
+{
+	private NotifyIcon _notifyIcon;
+
+	public this()
+	{
+		this.text = "NotifyIcon example";
+		this.size = Size(300, 200);
+		
+		MenuItem _menuItem1 = new MenuItem("Show");
+		_menuItem1.click ~= (MenuItem mi, EventArgs e) { msgBox("Hi!"); };
+
+		MenuItem _menuItem2 = new MenuItem("Close");
+		_menuItem2.click ~= (MenuItem mi, EventArgs e) { this.close(); };
+		
+		_notifyIcon = new NotifyIcon;
+		_notifyIcon.icon = new Icon(r".\image\icon.ico");
+		_notifyIcon.text = "This is tooltip text";
+		_notifyIcon.contextMenu = new ContextMenu;
+		_notifyIcon.contextMenu.menuItems.add(_menuItem1);
+		_notifyIcon.contextMenu.menuItems.add(_menuItem2);
+		_notifyIcon.show();
+	}
+}
+
+static this()
+{
+	Application.enableVisualStyles();
+}
+
+void main()
+{
+	Application.run(new MainForm());
+}