add sample say program

cmd/say/.gitignore

@@ -1,2 +1,3 @@
 *.mp3
 main
+say

cmd/say/main.go

@@ -1,8 +1,17 @@
 package main
 
 import (
+	"bufio"
+	"bytes"
 	"context"
+	"io"
+	"log"
 	"os"
+	"time"
+
+	"github.com/faiface/beep"
+	"github.com/faiface/beep/mp3"
+	"github.com/faiface/beep/speaker"
 
 	"github.com/taigrr/elevenlabs/client"
 	"github.com/taigrr/elevenlabs/client/types"
@@ -15,13 +24,28 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	saveFile, err := os.Create("sample.mp3")
+	buf := bytes.Buffer{}
+	w := bufio.NewWriter(&buf)
+
+	reader := bufio.NewReader(os.Stdin)
+	text, _ := reader.ReadString('\n')
+
+	err = client.TTSWriter(ctx, w, text, ids[0], types.SynthesisOptions{Stability: 0.75, SimilarityBoost: 0.75})
 	if err != nil {
 		panic(err)
 	}
-	defer saveFile.Close()
-	err = client.TTSWriter(ctx, saveFile, "hello, golang", ids[0], types.SynthesisOptions{Stability: 0.75, SimilarityBoost: 0.75})
+	r := io.NopCloser(bytes.NewReader(buf.Bytes()))
+	streamer, format, err := mp3.Decode(r)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
+	defer streamer.Close()
+
+	speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
+	done := make(chan bool)
+	speaker.Play(beep.Seq(streamer, beep.Callback(func() {
+		done <- true
+	})))
+
+	<-done
 }