add code

config.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"os"
+)
+
+type Config struct {
+	Prefix     string `json:"prefix"`
+	Token      string `json:"token"`
+	YtdlPath   string `json:"youtube-dl_path"`
+	FfmpegPath string `json:"ffmpeg_path"`
+}
+
+const configFile = "config.json"
+
+const tokenDefaultString = "insert your discord bot token here"
+
+func ReadConfig(cfg *Config) error {
+	configData, err := os.ReadFile(configFile)
+	if err != nil {
+		return errors.New("unable to read config file: " + err.Error())
+	}
+
+	json.Unmarshal(configData, cfg)
+	if err != nil {
+		return errors.New("unable to decode config file: " + err.Error())
+	}
+	return nil
+}
+
+func WriteDefaultConfig() error {
+	data, err := json.MarshalIndent(Config{
+		Prefix:     "!",
+		Token:      tokenDefaultString,
+		YtdlPath:   "youtube-dl",
+		FfmpegPath: "ffmpeg",
+	}, "", "\t")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(configFile, data, 0666)
+}