chore: add more information to README

Author: 0x9ef

readme.md

@@ -6,23 +6,53 @@ An Golang native implementation to easily interacting with OpenAI API.
 
 You can use environment variable to store API secret key
 ```
-export OPENAPI_KEY=YOUR_KEY
+export OPENAI_KEY=[YOUR_KEY]
 ```
 
 To initialize engine, use this:
 ```go
-e := openai.New(os.Getenv("OPENAPI_KEY"))
+e := openai.New(os.Getenv("OPENAI_KEY"))
 ```
 
+### Tips 
+
+#### Model
+If you want to use the most powerful model to generate text outputs, ensure that you are using "text-davinci-003". This model is defined as constant `openai.ModelTextDavinci003`.
+
+#### Text edition
+You can use the bundle Completion+Edit to regenerate the response based on the last context.
+```go
+e := openai.New(os.Getenv("OPENAI_KEY"))
+ctx := context.Background()
+completionResp, err := e.Completion(ctx, &openai.CompletionOptions{
+  // Choose model, you can see list of available models in models.go file
+	Model:  openai.ModelTextDavinci001, 
+  // Number of completion tokens to generate response. By default - 1024
+  MaxTokens: 1200, 
+  // Text to completion
+	Prompt: []string{"Write a little bit of Wikipedia. What is that?"},
+}) 
+
+editResp, err := e.Edit(ctx, &EditOptions{
+	Model:       ModelTextDavinci001,
+	Input:       completionResp.Choices[0],
+	Instruction: "Please rewrite a bit more and add more information about Wikipedia in different aspects. Please build based on that for 4 topics",
+})
+```
+
 ### Text completion example 
-Given a prompt, the model will return one or more predicted completions.
+Given a prompt, the model will return one or more predicted completions. 
+
+**Note**: the default number of completion tokens is 1024, if you want to increase or decrease this limit, you should change `MaxTokens` parameter. 
 
 ```go
-e := openai.New(os.Getenv("OPENAPI_KEY"))
+e := openai.New(os.Getenv("OPENAI_KEY"))
 r, err := e.Completion(context.Background(), &openai.CompletionOptions{
-    // Choose model, you can see list of available models in models.go file
+  // Choose model, you can see list of available models in models.go file
 	Model:  openai.ModelTextDavinci001, 
-    // Text to completion
+  // Number of completion tokens to generate response. By default - 1024
+  MaxTokens: 1200, 
+  // Text to completion
 	Prompt: []string{"Write a little bit of Wikipedia. What is that?"},
 })
 ```
@@ -70,7 +100,7 @@ import (
 ) 
 
 func main() {
-    e := openai.New(os.Getenv("OPENAPI_KEY"))
+    e := openai.New(os.Getenv("OPENAI_KEY"))
     r, err := e.Completion(context.Background(), &openai.CompletionOptions{
         // Choose model, you can see list of available models in models.go file
         Model:  openai.ModelTextDavinci001, 
@@ -93,7 +123,7 @@ func main() {
 Lists the currently available models, and provides basic information about each one such as the owner and availability.
 
 ```go
-e := openai.New(os.Getenv("OPENAPI_KEY"))
+e := openai.New(os.Getenv("OPENAI_KEY"))
 r, err := e.ListModels(context.Background())
 if err != nil {
 	log.Fatal(err)
@@ -127,12 +157,12 @@ You will get the next output:
     ...
   ]
 }
-```
+``` 
 
 To retrieve information about specified model instead of all models, you can do this:
 
 ```go
-e := openai.New(os.Getenv("OPENAPI_KEY"))
+e := openai.New(os.Getenv("OPENAI_KEY"))
 r, err := e.RetrieveModel(context.Background(), &openai.RetrieveModelOptions{
 		ID: openai.ModelDavinci,
 	})