Add moderation example (#23)

examples/moderation/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+
+	"github.com/rakyll/openai-go"
+	"github.com/rakyll/openai-go/moderation"
+)
+
+func main() {
+	ctx := context.Background()
+	s := openai.NewSession(os.Getenv("OPENAI_API_KEY"))
+
+	client := moderation.NewClient(s, "text-moderation-latest")
+	resp, err := client.Create(ctx, &moderation.CreateParams{
+		Input: []string{"I will kill you"},
+	})
+	if err != nil {
+		log.Fatalf("Failed to complete: %v", err)
+	}
+
+	for _, result := range resp.Results {
+		log.Println("Content moderation is flagged as", result.Flagged)
+		if result.Flagged {
+			for key, value := range result.Categories {
+				if value {
+					log.Println("Content category is", key)
+				}
+			}
+		}
+	}
+}