Enhance app.py with detailed component description and usage instructions for SimpleTextExtractFromPDF demo

app.py

@@ -9,8 +9,28 @@ demo = gr.Interface(
     fn=first_200_chars,
     inputs=SimpleTextExtractFromPDF(label="Upload a PDF file"),
     outputs="text",
-    title="First 200 Characters",
-    description="Enter some text and see the first 200 characters.",
+    title="SimpleTextExtractFromPDF Demo - First 200 Characters",
+    description="""
+## Component Description
+
+This space is to demo the usage of the SimpleTextExtractFromPDF component.
+
+This component provides a simple interface to extract text from a PDF file. The extracted text can be submitted as a string input to a function for further processing.
+
+- **Text Extraction Only:** Only the text content is extracted from the PDF. Images and table structures are not preserved.
+- **Flexible Upload Options:** Users can upload a PDF file from their device or provide a URL to the PDF.
+- **Input Component:** The component is primarily designed to be used as an input, allowing users to submit the extracted text to other functions.
+- **Output Display:** When used as an output component, the extracted string content is displayed in a textarea.
+
+The demo app here uses the SimpleTextExtractFromPDF component as an input component to extract the text from a PDF file and then show the first 200 characters of the extracted text.
+""",
+    article="""
+<p>
+    <code>pip install gradio-simpletextextractfrompdf</code>
+    <br>
+    <a href="https://pypi.org/project/gradio-simpletextextractfrompdf/"> https://pypi.org/project/gradio-simpletextextractfrompdf/</a>
+</p>
+""",
 )
 
 demo.launch()