chore: add gitignore and build configuration

Package.swift

@@ -0,0 +1,16 @@
+// swift-tools-version: 6.0
+import PackageDescription
+
+let package = Package(
+    name: "kite",
+    targets: [
+        .target(name: "KiteCore"),
+        .executableTarget(
+            name: "kite",
+            dependencies: ["KiteCore"]),
+        .testTarget(
+            name: "KiteCoreTests",
+            dependencies: ["KiteCore"]),
+    ],
+    swiftLanguageModes: [.v5]
+)