[doc][test] add 'args' to usage and add integration test

.github/main.workflow

@@ -0,0 +1,9 @@
+workflow "Integration tests" {
+  on = "push"
+  resolves = ["Quickstart"]
+}
+
+action "Quickstart" {
+  uses = "icepuma/rust-action@master"
+  args = "cd integration-test && cargo fmt -- --check && cargo clippy -- -Dwarnings && cargo test"
+}