fix readme code embed

Author: Damion Werner

README.md

@@ -25,7 +25,40 @@ Data only needs to be serialisable when explicitly send to other processes.
 
 # Code Example
 
-<<< @../../malstrom-core/examples/look_ma_im_streaming.rs
+```rust
+//! Stream processing can be easy!
+use malstrom::operators::*;
+use malstrom::runtime::MultiThreadRuntime;
+use malstrom::sinks::{StatelessSink, StdOutSink};
+use malstrom::snapshot::NoPersistence;
+use malstrom::sources::{SingleIteratorSource, StatelessSource};
+use malstrom::worker::StreamProvider;
+
+fn main() {
+    MultiThreadRuntime::builder()
+        .persistence(NoPersistence)
+        .parrallelism(1)
+        .build(build_dataflow)
+        .execute()
+        .unwrap();
+}
+
+fn build_dataflow(provider: &mut dyn StreamProvider) {
+    provider
+        .new_stream()
+        .source(
+            "words",
+            StatelessSource::new(SingleIteratorSource::new([
+                "Look",
+                "ma'",
+                "I'm",
+                "streaming",
+            ])),
+        )
+        .map("upper", |x| x.to_uppercase())
+        .sink("stdout", StatelessSink::new(StdOutSink));
+}
+```
 
 This outputs