update docs

README.md

@@ -30,6 +30,77 @@ instance := chatnio.NewInstanceFromEnv("CHATNIO_TOKEN")
 
 - Chat
 ```go
+chat := instance.NewChat(-1) // id -1: creating new chat
+
+// using hook
+chat.AskStream(&chatnio.ChatRequestForm{
+	Message: "hello",
+	Model:   "gpt-3.5-turbo",
+}, func(resp chatnio.ChatPartialResponse) {
+	fmt.Println(resp.End, resp.Quota, resp.Message, resp.Keyword)
+})
+
+// or using channel
+channel := make(chan ChatPartialResponse)
+chat.Ask(&ChatRequestForm{
+    Message: "hello",
+    Model:   "gpt-3.5-turbo",
+}, channel)
+
+for resp := range channel {
+    // do something
+}
+```
+
+- Conversation
+```go
+// list conversations
+if list, err := instance.GetConversationList(); err == nil {
+    for _, conv := range list {
+        fmt.Println(conv.Id, conv.Name)
+    }
+}
+
+// get conversation
+if conv, err := instance.GetConversation(1); err == nil {
+    fmt.Println(conv.Id, conv.Name, conv.Message)
+}
+
+// delete conversation
+if err := instance.DeleteConversation(1); err == nil {
+    fmt.Println("deleted")
+}
+```
+
+- Quota
+```go
+// get quota
+if quota, err := instance.GetQuota(); err == nil {
+    fmt.Println(fmt.Sprintf("current quota is %0.2f", quota))
+}
+
+// buy quota
+if quota, err := instance.BuyQuota(100); err == nil {
+    fmt.Println("bought successfully")
+}
+```
+
+- Subscription and Package
+```go
+// get subscription
+if sub, err := instance.GetSubscription(); err == nil {
+    fmt.Println(sub.IsSubscribed, sub.Expired)
+}
+
+// buy subscription
+if err := instance.Subscribe(1); err == nil {
+    fmt.Println("bought subscription for 1 month successfully")
+}
+
+// get package
+if pkg, err := instance.GetPackage(); err == nil {
+    fmt.Println(pkg.Data.Cert, pkg.Data.Teenager)
+}
 ```