add description

app.py

@@ -105,6 +105,24 @@ def add_mask(text):
 
 with gr.Blocks() as demo:
     
+    text_description="""
+    # TimeLMs Demo
+
+    This is a demo for **timeLMs**:
+    - [Github](https://github.com/cardiffnlp/timelms)
+    - [Paper](https://aclanthology.org/2022.acl-demo.25.pdf)
+
+    Input any text with a *\<mask\>* token as in the example, and (the demo does not
+    use GPUs, and it takes about 1 min). In the graph, we show the probability of 
+    some token candidates for mask over different months. 
+    
+    In this demo we run use a roberta-base model trained on tweets, where the first two 
+    tokens are the year and the month ("21 1" for January 2021). It was trained 
+    for tweets between January 2018 to December 2021).
+    """
+    
+    description = gr.Markdown(text_description)
+    
     textbox = gr.Textbox(value="Happy <mask>!", max_lines=1)
 
     with gr.Row():