feat(tracker): create initial tracker skeleton using Gio

go4k/tracker/keyevent.go

@@ -0,0 +1,17 @@
+package tracker
+
+import (
+	"gioui.org/io/key"
+	"os"
+)
+
+// KeyEvent handles incoming key events and returns true if repaint is needed.
+func (t *Tracker) KeyEvent(e key.Event) bool {
+	if e.State == key.Press {
+		switch e.Name {
+		case key.NameEscape:
+			os.Exit(0)
+		}
+	}
+	return false
+}