added comments

backend/pkg/cors/cors.go

@@ -2,6 +2,7 @@ package cors
 
 import "net/http"
 
+// HandlerForOrigin returns a CORS middleware function that sets headers based on the requested origin.
 func HandlerForOrigin(origin string) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -22,6 +23,7 @@ func HandlerForOrigin(origin string) func(http.Handler) http.Handler {
 	}
 }
 
+// DeafaultHandler: Returns a handler that allows requests from any origin by delegating to a handler that allows all origins.
 func DeafaultHandler(next http.Handler) http.Handler {
 	return HandlerForOrigin("*")(next)
 }