Working version

README.md

@@ -1,2 +1,19 @@
 # access-cell
-A synchronous, single-threaded Mutex<T> anti-locking system
+A synchronous, single-threaded Mutex<T> anti-locking system
+
+```rust
+let value = Arc::new(AccessCell::new(0));
+
+value.access({
+    let value = value.clone();
+
+    move |_| {
+        // normally this would cause a deadlock
+        value.access(|v| {
+            *v = 10;
+        })
+    }
+});
+
+assert_eq!(*value.access_ref(), 10);
+```