nip19, subscription, publication code examples added to README.md

fixed typo in example/example.go

README.md

@@ -11,12 +11,80 @@ A set of useful things for [Nostr Protocol](https://github.com/nostr-protocol/no
 
 ``` go
 sk, _ := nostr.GenerateKey()
+pk, _ := nostr.GetPublicKey(sk)
+nsec, _ = nip19.EncodePrivateKey(sk)
+npub, _ = nip19.EncodePublicKey(pk)
 
 fmt.Println("sk:", sk)
 fmt.Println("pk:", nostr.GetPublicKey(sk))
+fmt.Println(nsec)
+fmt.Println(npub)
 ```
 
-### Subscriptions
+### Subscribing to a single relay
+
+``` go
+relay, err := nostr.RelayConnect(context.Background(), "wss://nostr.zebedee.cloud")
+if err != nil {
+	panic(err)
+}
+
+npub := "npub1422a7ws4yul24p0pf7cacn7cghqkutdnm35z075vy68ggqpqjcyswn8ekc"
+
+var filters nostr.Filters
+if _, v, err := nip19.Decode(npub); err == nil {
+	pub := v.(string)
+	filters = []nostr.Filter{{
+		Kinds:   []int{1},
+		Authors: []string{pub},
+		Limit:   1,
+	}}
+} else {
+	panic(err)
+}
+
+sub := relay.Subscribe(context.Background(), filters)
+
+go func() {
+	<-sub.EndOfStoredEvents
+	// handle end of stored events (EOSE, see NIP-15)
+}()
+
+for ev := range sub.Events {
+	// handle returned event.
+	// channel will stay open until sub.Unsub() is called
+}
+```
+
+### Publishing to a single relay
+
+``` go
+sk := nostr.GeneratePrivateKey()
+pub, _ := nostr.GetPublicKey(sk)
+
+ev := nostr.Event{
+	PubKey:    pub,
+	CreatedAt: time.Now(),
+	Kind:      1,
+	Tags:      nil,
+	Content:   "Hello World!",
+}
+
+// calling Sign sets the event ID field and the event Sig field
+ev.Sign(sk)
+
+// publish the event to two relays
+for _, url := range []string{"wss://nostr.zebedee.cloud", "wss://nostr-pub.wellorder.net"} {
+	relay, e := nostr.RelayConnect(context.Background(), url)
+	if e != nil {
+		fmt.Println(e)
+		continue
+	}
+	fmt.Println("published to ", url, relay.Publish(context.Background(), ev))
+}
+```
+
+### Example script
 
 ```
 go run example/example.go

example/example.go

@@ -37,7 +37,7 @@ func main() {
 	if _, v, err := nip19.Decode(npub); err == nil {
 		t := make(map[string][]string)
 		// making a "p" tag for the above public key.
-		// this filters for messages tagged with the user "npub1sg6plz..." (mainly replies to this user).
+		// this filters for messages tagged with the user, mainly replies.
 		t["p"] = []string{v.(string)}
 		filters = []nostr.Filter{{
 			Kinds: []int{1},