Add main window

src/main/kotlin/org/bm00/data-accessor/ProgramWindow.kt

@@ -0,0 +1,31 @@
+package org.bm00.`data-accessor`
+
+import jexer.TAction
+import jexer.TApplication
+import jexer.TWindow
+import jexer.layout.StretchLayoutManager
+import java.io.IOException
+import java.util.*
+
+class ProgramWindow private constructor(parent: TApplication, flags: Int) :
+    TWindow(parent, "O.S.D.A.", 0, 0, Config().windowWidth, Config().windowHeight, flags) {
+    constructor(parent: TApplication) : this(parent, CENTERED)
+    init {
+        setLayoutManager(
+            StretchLayoutManager(
+                width - 2,
+                height - 2
+            )
+        )
+        addLabel("Welcome to The ORG-NAME-WIP Secure Data Accessor - OSDA", CENTERED, CENTERED - 4)
+
+
+        addButton("Exit...", CENTERED + 14, CENTERED + 6,
+            object : TAction() {
+                override fun DO() {
+                    System.exit(0)
+                }
+            }
+        )
+    }
+}