Update README

Signed-off-by: shiyu22 <shiyu.chen@zilliz.com>

README.md

@@ -49,7 +49,7 @@ $ pip3 install towhee
 >>> from towhee import pipeline
 >>> from PIL import Image
 
->>> img = Image.open('path/to/your/image')
+>>> img = Image.open('path/to/your/image') # for example, './test_data/test.jpg'
 >>> embedding_pipeline = pipeline('towhee/image-embedding-resnet50')
 >>> embedding = embedding_pipeline(img)
 ```