restructure, begin implementing libplt

plt-build/src/jvmMain/kotlin/app/hakurei/planterette/api/dsl/Task.kt

@@ -0,0 +1,16 @@
+package app.hakurei.planterette.api
+
+interface Task {
+    val execute: String
+}
+class AptInstallTask(val packages: List<String>) : Task {
+    private fun getPackageList(): String {
+        var string = ""
+        packages.forEach { p ->
+            string += "$p "
+        }
+        return string
+    }
+    override val execute: String
+        get() = "sudo apt install ${getPackageList()}"
+}