add first source and waf build script

.gitignore

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+/build/
+/.waf*/

src/main.vala

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+using Gtk;
+
+int main(string[] args)
+{
+    Gtk.init(ref args);
+
+    var window = new Window();
+    window.title = "File selector demo";
+    window.border_width = 10;
+    window.window_position = WindowPosition.CENTER;
+    window.destroy.connect(Gtk.main_quit);
+
+    var button = new Button.with_label("Select a file");
+    button.clicked.connect(() => {
+        button.label = "clicked";
+    });
+
+    window.add(button);
+    window.show_all();
+
+    Gtk.main();
+
+    return 0;
+}

wscript

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+def options(opt):
+    opt.load("compiler_c")
+    opt.load("vala")
+
+def configure(conf):
+    conf.load("compiler_c")
+    conf.load("vala")
+    conf.check_cfg(
+            package = "glib-2.0",
+            uselib_store = "GLIB",
+            mandatory = 1,
+            args = "--cflags --libs")
+    conf.check_cfg(
+            package = "gtk+-3.0",
+            uselib_store = "GTK",
+            mandatory = 1,
+            args = "--cflags --libs")
+
+def build(bld):
+    bld.program(
+            packages = "gtk+-3.0",
+            target = "vala-file-chooser",
+            uselib = "GTK GLIB",
+            source = bld.path.ant_glob("src/**/*.vala")
+    )