build(connector): add Compose and split desktop app and server

connector/shared/src/commonMain/kotlin/Constants.kt

@@ -0,0 +1 @@
+const val SERVER_PORT = 8080

connector/shared/src/commonMain/kotlin/Greeting.kt

@@ -0,0 +1,7 @@
+class Greeting {
+    private val platform = getPlatform()
+
+    fun greet(): String {
+        return "Hello, ${platform.name}!"
+    }
+}

connector/shared/src/commonMain/kotlin/Platform.kt

@@ -0,0 +1,5 @@
+interface Platform {
+    val name: String
+}
+
+expect fun getPlatform(): Platform

connector/shared/src/jvmMain/kotlin/Platform.jvm.kt

@@ -0,0 +1,5 @@
+class JVMPlatform: Platform {
+    override val name: String = "Java ${System.getProperty("java.version")}"
+}
+
+actual fun getPlatform(): Platform = JVMPlatform()