Add README

crates/rdsys-backend/README.md

@@ -0,0 +1,20 @@
+# rdsys backend API
+
+### Usage
+
+```
+use rdsys_backend::start_stream;
+use tokio;
+
+#[tokio::main]
+async fn main() {
+    let endpoint = String::from("http://127.0.0.1:7100/resource-stream");
+    let name = String::from("https");
+    let token = String::from("HttpsApiTokenPlaceholder");
+    let types = vec![String::from("obfs2"), String::from("scramblesuit")];
+    let rx = start_stream(endpoint, name, token, types).await.unwrap();
+    for diff in rx {
+        println!("Received diff: {:?}", diff);
+    }
+}
+```