Add initial project structure with .gitignore, Package.swift, and submodule configuration

Author: lijy91

.gitignore

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+.build/
+.swift-version

.gitmodules

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+[submodule "Sources/libnativeapi"]
+	path = Sources/libnativeapi
+	url = https://github.com/leanflutter/libnativeapi.git

Package.swift

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+// swift-tools-version:6.0
+import PackageDescription
+
+let package = Package(
+    name: "nativeapi",
+    targets: [
+        .executableTarget(
+            name: "Example",
+            dependencies: ["libnativeapi"],
+            swiftSettings: [
+                .interoperabilityMode(.Cxx)
+            ]
+        ),
+        .target(
+            name: "libnativeapi",
+            exclude: [
+                "examples",
+                "src/screen_retriever_linux.cpp",
+                "src/screen_retriever_linux.h",
+                "src/screen_retriever_windows.cpp",
+                "src/screen_retriever_windows.h",
+            ],
+            linkerSettings: [
+                .linkedFramework("Cocoa"),
+                .linkedFramework("Foundation")
+            ]
+        ),
+    ],
+    cxxLanguageStandard: .cxx17
+)

Sources/Example/main.swift

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+import libnativeapi
+
+var screenRetriever = ScreenRetrieverMacOS()
+let cursorPoint = screenRetriever.GetCursorScreenPoint()
+let primaryDisplay = screenRetriever.GetPrimaryDisplay()
+let allDisplays = screenRetriever.GetAllDisplays()
+
+print(cursorPoint)
+print(primaryDisplay)
+print(allDisplays)
+
+print(String(cString: primaryDisplay.id))
+print(String(cString: primaryDisplay.name))