feat(waifu.py): Add elapsed time display (#12)

Because I meet with this kind of problem today again.

src/kqs/waifu.py

@@ -1,3 +1,4 @@
+import time
 from typing import Dict, List
 from xml.dom import minidom
 from xml.etree import ElementTree as ET
@@ -116,6 +117,8 @@ def pre_read_warn(mode: str, file_path: str, text: str, url: str):
                     'WARN:"text" is not standard Keqing read mode, it caughted by fallback system and recognized as "memory"'
                 )
 
+        time_start = time.time()
+
         if mode == "file" or (
             (mode == "memory" or mode == "text") and text == ""
         ):
@@ -140,6 +143,9 @@ def pre_read_warn(mode: str, file_path: str, text: str, url: str):
         else:
             raise TypeError(f"Unexpected read mode: {mode}")
 
+        time_end = time.time()
+        print("[TIME]: " + str(round((time_end - time_start), 3)) + "s" + "\n")
+
     def read_file(self, file_path: str):
         tree: ElementTree = ET.parse(file_path)
         root: Element = tree.getroot()