add tasker module description and samples

samples/tasker-test3.lua

@@ -0,0 +1,10 @@
+function on_resume()
+    ui:show_text("Click me")
+end
+
+function on_click()
+    tasker:run_task("Test", {
+        firstname = "John",
+        lastname = "Doe",
+    })
+end