sign up text added

app.py

@@ -51,7 +51,9 @@ with gr.Blocks(theme=gr.themes.Default(primary_hue="blue")) as demo:
         gr.Image(value="https://lh3.googleusercontent.com/d/1e49skZjYGTZscWCVrhf6Ad1bRP2pvwpI", height=60)
         gr.Markdown("<div>&nbsp;</div>")  # Add some space below the image
     gr.Markdown("# Root Evaluators Demo by Root Signals")
-    
+
+    gr.Markdown("[Sign-up](https://app.rootsignals.ai/register) to Root Signals Platform the get your API key!")
+
     api_key = gr.Textbox(
         label="🔑 Root Signals API Key",
         placeholder="Enter your Root Signals API key...",