Added support for Edits endpoint & other minor changes (#22)

* Added support for Moderations API

* gofmt moderation.go

* support for edits endpoint & other improvements

edits.go

@@ -0,0 +1,57 @@
+package gogpt
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+)
+
+// EditsRequest represents a request structure for Edits API
+type EditsRequest struct {
+	Model       *string `json:"model,omitempty"`
+	Input       string  `json:"input,omitempty"`
+	Instruction string  `json:"instruction,omitempty"`
+	N           int     `json:"n,omitempty"`
+	Temperature float32 `json:"temperature,omitempty"`
+	TopP        float32 `json:"top_p,omitempty"`
+}
+
+// EditsUsage represents Usage of EditsResponse
+type EditsUsage struct {
+	PromptTokens     int `json:"prompt_tokens"`
+	CompletionTokens int `json:"completion_tokens"`
+	TotalTokens      int `json:"total_tokens"`
+}
+
+// Choice represents one of possible edits
+type Choice struct {
+	Text  string `json:"text"`
+	Index int    `json:"index"`
+}
+
+// EditsResponse represents a response structure for Edits API
+type EditsResponse struct {
+	Object  string     `json:"object"`
+	Created uint64     `json:"created"`
+	Usage   EditsUsage `json:"usage"`
+	Choices []Choice   `json:"choices"`
+}
+
+// Perform an API call to the Edits endpoint.
+func (c *Client) Edits(ctx context.Context, request EditsRequest) (response EditsResponse, err error) {
+	var reqBytes []byte
+	reqBytes, err = json.Marshal(request)
+	if err != nil {
+		return
+	}
+
+	req, err := http.NewRequest("POST", c.fullURL("/edits"), bytes.NewBuffer(reqBytes))
+	if err != nil {
+		return
+	}
+
+	req = req.WithContext(ctx)
+	err = c.sendRequest(req, &response)
+	return
+}