add analytics code

app.py

@@ -77,6 +77,18 @@ h3 {
 }
 """
 
+ANALYTICS_HEAD = """
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-JLBL393020"></script>
+"""
+ANALYTICS_JS = """
+function() {
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+  gtag('config', 'G-JLBL393020');
+}
+"""
+
 tokenizer = AutoTokenizer.from_pretrained(MODEL)
 model = AutoModelForCausalLM.from_pretrained(
     MODEL,
@@ -135,7 +147,8 @@ def stream_chat(
             
 chatbot = gr.Chatbot(height=600, placeholder=PLACEHOLDER)
 
-with gr.Blocks(css=CSS, theme="soft") as demo:
+with gr.Blocks(head=ANALYTICS_HEAD, css=CSS, theme="soft") as demo:
+    demo.load(None, js=ANALYTICS_JS)
     gr.HTML(TITLE)
     gr.DuplicateButton(value="Duplicate Space for private use", elem_classes="duplicate-button")
     gr.Markdown(DESCRIPTION)