create a Window on application startup

src/jes.cc

@@ -1,6 +1,16 @@
 #include <iostream>
+#include "Window.h"
 
 int main(int argc, char * argv[])
 {
-    std::cout << "Coming soon." << std::endl;
+    Window w;
+    if (!w.create())
+    {
+        std::cerr << "Error creating window." << std::endl;
+        return 1;
+    }
+
+    w.run_event_loop();
+
+    return 0;
 }