start: add config system

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/config/struct.go

@@ -0,0 +1,30 @@
+package config
+
+import (
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	Database struct {
+		Path string `mapstructure:"path"`
+	} `mapstructure:"database"`
+}
+
+func LoadConfig(path string) (*Config, error) {
+	v := viper.New()
+	v.SetConfigFile(path)
+	v.SetConfigType("yaml")
+
+	v.SetDefault("database.path", "./data/")
+
+	if err := v.ReadInConfig(); err != nil {
+		return nil, err
+	}
+
+	var cfg Config
+	if err := v.Unmarshal(&cfg); err != nil {
+		return nil, err
+	}
+
+	return &cfg, nil
+}