Initial commit - extracted urpc from monorepo

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+# urpc
+
+A minimalistic RPC framework for Rust, designed for simplicity and performance.
+
+## Features
+
+- Async/await support
+- TCP and Unix socket transport
+- Procedural macros for service definitions
+- Serialization with bincode
+- Lightweight and fast
+
+## Example
+
+```rust
+use urpc::*;
+
+#[urpc::service]
+trait Hello {
+    type Error = ();
+    
+    async fn hello(name: String) -> String;
+}
+
+struct HelloServer;
+
+impl Hello for HelloServer {
+    async fn hello(&self, _ctx: urpc::Context, name: String) -> Result<String, ()> {
+        Ok(format!("Hello, {}!", name))
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    // Server
+    let listener = urpc::tcp::bind("127.0.0.1:8080").await.unwrap();
+    
+    tokio::spawn(async move {
+        urpc::Server::default()
+            .with_listener(listener)
+            .with_service(HelloServer.into_service())
+            .serve()
+            .await
+    });
+    
+    // Client
+    let channel = urpc::ClientChannel::new(
+        urpc::tcp::connect("127.0.0.1:8080").await.unwrap()
+    );
+    let client = HelloClient::new(channel);
+    
+    let response = client.hello("World".to_string()).await.unwrap();
+    println!("{}", response); // "Hello, World!"
+}
+```
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0
+- MIT License
+
+at your option.
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