Add advanced code example to documentation (#3026)

* Add advanced code example

* Update templates/experimental/worker-rust/README.md

Co-authored-by: Jacob M-G Evans <[email protected]>

* Run Prettier

* Change Example

* Update README.md

Add link to workers-rs

* Fix README.md formatting

---------

Co-authored-by: Jacob M-G Evans <[email protected]>

templates/experimental/worker-rust/README.md

@@ -40,6 +40,41 @@ $ npm run deploy
 
 Read the latest `worker` crate documentation here: https://docs.rs/worker
 
+## Advanced Example
+
+As this template comprises only the essential setup, we recommend considering our advanced example to leverage its additional functionalities. The advanced example showcases the creation of multiple routes, logging of requests, retrieval of field data from a form, and other features that may prove useful to your project.  
+The following example has been taken from: [workers-rs](https://github.com/cloudflare/workers-rs). You can learn more about how to use workers with rust by going there.
+
+```rust
+use worker::*;
+
+#[event(fetch)]
+pub async fn main(req: Request, env: Env, _ctx: worker::Context) -> Result<Response> {
+    console_log!(
+        "{} {}, located at: {:?}, within: {}",
+        req.method().to_string(),
+        req.path(),
+        req.cf().coordinates().unwrap_or_default(),
+        req.cf().region().unwrap_or("unknown region".into())
+    );
+
+    if !matches!(req.method(), Method::Post) {
+        return Response::error("Method Not Allowed", 405);
+    }
+
+    if let Some(file) = req.form_data().await?.get("file") {
+        return match file {
+            FormEntry::File(buf) => {
+                Response::ok(&format!("size = {}", buf.bytes().await?.len()))
+            }
+            _ => Response::error("`file` part of POST form must be a file", 400),
+        };
+    }
+
+    Response::error("Bad Request", 400)
+}
+```
+
 ## WebAssembly
 
 `workers-rs` (the Rust SDK for Cloudflare Workers used in this template) is meant to be executed as compiled WebAssembly, and as such so **must** all the code you write and depend upon. All crates and modules used in Rust-based Workers projects have to compile to the `wasm32-unknown-unknown` triple.