chore: add gitignore and build configuration

.gitignore

@@ -0,0 +1,13 @@
+# swiftpm / build tooling
+.build/
+.swiftpm/
+Package.resolved
+
+# xcode
+xcuserdata/
+DerivedData/
+
+# os / logs / env
+.DS_Store
+*.log
+.env

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]
+)