readme: add example

Author: kkharji

README.md

@@ -1,3 +1,56 @@
 # Build Server Protocol
 
 [Build Server Protocol](https://build-server-protocol.github.io/docs/specification.html) client, server and type definition in rust.
+
+## Example 
+
+```rust 
+use anyhow::Result;
+use bsp_server::{types::*, *};
+
+fn main() -> Result<()> {
+    install_tracing("/tmp/", "xcodebase-server.log", false)?;
+    let (conn, io_threads) = Connection::stdio();
+
+    tracing::info!("Started------------------------------");
+
+    let params = conn.initialize(|params| crate::server::initialize(&params).expect("Initialize"))?;
+
+    block(conn, params)?;
+
+    io_threads.join()?;
+
+    tracing::info!("Ended ------------------------------");
+
+    Ok(())
+}
+
+fn block(conn: Connection, _initialize_params: InitializeBuild) -> Result<()> {
+    for msg in &conn.receiver {
+        match msg {
+            Message::Request(req) => {
+                use Request::*;
+                match req {
+                    Shutdown(_) => {
+                        conn.handle_shutdown(&req)?;
+                        return Ok(());
+                    }
+                    WorkspaceBuildTargets(id) => {
+                        conn.send((id, WorkspaceBuildTargetsResult::default()))?;
+                    }
+                    BuildTargetSources(id, _) => {
+                        conn.send((id, BuildTargetSourcesResult::default()))?;
+                    }
+                    _ => {
+                        tracing::warn!("Unable to handle:\n\n{:#?}\n", req);
+                        conn.send(Response::method_not_found(req.id().clone(), "".into()))?;
+                    }
+                };
+            }
+            Message::Response(_) => {}
+            Message::Notification(_) => {}
+        };
+    }
+    Ok(())
+}
+```