chore: update readme, add NATS example

README.md

@@ -1,2 +1,42 @@
 # nacl
+
 Client helper for NATS/STAN
+
+## examples
+
+connect to NATS
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/jar3b/grawt"
+    "github.com/jar3b/nacl"
+    "github.com/kelseyhightower/envconfig"
+)
+
+func main() {
+    // get params
+    conf := config.NewConfig()
+
+	// init waiter (github.com/jar3b/grawt)
+	var waiter = grawt.NewWaiter()
+
+	// init nats
+	var subscriptions []*nacl.NatsSubscription
+	if err := nacl.SetupNats(conf.Nats.Host, conf.Nats.Port, conf.Nats.User, conf.Nats.Pass,
+		// handler called before app closed
+        // we need to terminate sub's properly and sometimes doing another actions (finalizers)
+        waiter.AddCloseHandler(func() {
+			nacl.FinalizeNats(&subscriptions)
+		}, false),
+	); err != nil {
+		waiter.Halt(fmt.Errorf("cannot connect to nats: %v", err))
+	}
+	defer nacl.NatsClient.Close()
+	
+    // here we add some subscriptions and wait (using blocking call)
+    // ...
+}
+```