Added CORS section in server config

Author: PythonHacker24

config/server.go

@@ -1,9 +1,14 @@
 package config
 
+type CORS struct {
+	AllowedOrigins []string `yaml:"allowed_origins"`
+}
+
 /* server deployment parameters */
 type Server struct {
 	Host string `yaml:"host,omitempty"`
 	Port int    `yaml:"port,omitempty"`
+	Cors CORS 	`yaml:"cors"`
 }
 
 /* normalization function */
@@ -19,5 +24,10 @@ func (s *Server) Normalize() error {
 		s.Port = 8080
 	}
 
+	/* set default cors policy to localhost */
+	if len(s.Cors.AllowedOrigins) == 0 {
+		s.Cors.AllowedOrigins = append(s.Cors.AllowedOrigins, "http://localhost:3000")
+	}
+
 	return nil
 }