adds a very simple fastHTML example (#873)

07_web_endpoints/fasthtml_app.py

@@ -0,0 +1,25 @@
+# ---
+# deploy: true
+# cmd: ["modal", "serve", "07_web_endpoints/fasthtml_app.py"]
+# ---
+import modal
+
+app = modal.App("example-fasthtml")
+
+
+@app.function(
+    image=modal.Image.debian_slim(python_version="3.12").pip_install(
+        "python-fasthtml==0.5.2"
+    )
+)
+@modal.asgi_app()  # must define a function decorated with asgi_app and app.function that returns your fastHTML app
+def serve():
+    import fasthtml.common as fh
+
+    app = fh.FastHTML()
+
+    @app.get("/")
+    def home():
+        return fh.Div(fh.P("Hello World!"), hx_get="/change")
+
+    return app