added terminal app with example hello world

src/lib/CLIBase.hx

@@ -0,0 +1,6 @@
+package lib;
+
+abstract class CLIBase {
+	public function new() {};
+	public abstract function invoke(handle: TermHandle): Bool;
+}

src/lib/TermHandle.hx

@@ -0,0 +1,29 @@
+package lib;
+
+import haxe.ds.ReadOnlyArray;
+
+typedef TermHandleEvents = {
+	onWrite: String->Void,
+	onNewLine: Void->Void,
+}
+
+class TermHandle {
+	public final args:ReadOnlyArray<String>;
+	private final events:TermHandleEvents;
+
+	@:allow(bin.Terminal)
+	private function new(args: Array<String>, events: TermHandleEvents) {
+		this.args = args;
+		this.events = events;
+	}
+
+	public function write(s:String) {
+		this.events.onWrite(s);
+	}
+
+	public function writeLn(s:String = "") {
+		if (s != "")
+			this.events.onWrite(s);
+		this.events.onNewLine();
+	}
+}