update readme.

Signed-off-by: wxywb <xy.wang@zilliz.com>

README.md

@@ -18,18 +18,18 @@ This operator extracts features for image or text with [CLIP](https://arxiv.org/
 ## Code Example
 
 Load an image from path './teddy.jpg' to generate an image embedding. 
-Read the text 'a dog' to generate an text embedding. 
+Read the text 'A teddybear on a skateboard in Times Square.' to generate an text embedding. 
  *Write the pipeline in simplified style*:
 
 ```python
 import towhee
 
-towhee.glob('./dog.jpg') \
+towhee.glob('./teddy.jpg') \
       .image_decode.cv2() \
       .towhee.clip(name='ViT-B/32', modality='image') \
       .show()
 
-towhee.dc(["a dog"]) \
+towhee.dc(["A teddybear on a skateboard in Times Square."]) \
       .image_decode.cv2() \
       .towhee.clip(name='ViT-B/32', modality='text') \
       .show()
@@ -42,19 +42,19 @@ towhee.dc(["a dog"]) \
 ```python
 import towhee
 
-towhee.glob['path']('./dog.jpg') \
+towhee.glob['path']('./teddy.jpg') \
       .image_decode.cv2['path', 'img']() \
       .towhee.clip['data', 'vec'](name='ViT-B/32', modality='image') \
       .select['data', 'vec']() \
       .show()
 
-towhee.dc(["a dog"]) \
-      .select['img', 'vec']() \
-      .towhee.clip['data', 'vec'](name='ViT-B/32', modality='image') \
-      .select['data', 'vec']() \
+towhee.dc['text'](["A teddybear on a skateboard in Times Square."]) \
+      .towhee.clip['text','vec'](name='ViT-B/32', modality='text') \
+      .select['text', 'vec']() \
       .show()
 ```
 <img src="https://towhee.io/towhee/clip/raw/branch/main/tabular1.png" alt="result1" style="height:60px;"/>
+<img src="https://towhee.io/towhee/clip/raw/branch/main/tabular2.png" alt="result2" style="height:60px;"/>
 
 
 <br />
@@ -71,7 +71,16 @@ Create the operator via the following factory method
 
 ​   ***name:*** *str*
 
-​   The model name of CLIP. 
+​   The model name of CLIP. avaliable options are: 
+- RN50      
+- RN101     
+- RN50x4
+- RN50x16 
+- RN50x64
+- ViT-B/32 
+- ViT-B/64 
+- ViT-L/14 
+
 
 ​   ***modality:*** *str*
 
@@ -83,7 +92,7 @@ Create the operator via the following factory method
 
 ## Interface
 
-An image-text embedding operator takes a [towhee image](link/to/towhee/image/api/doc) or string as input and generate an image embedding in ndarray.
+An image-text embedding operator takes a [towhee image](link/to/towhee/image/api/doc) or string as input and generate an embedding in ndarray.
 
 
 **Parameters:**