[rs] Adapter describe example

wgpu/examples/describe/main.rs

@@ -0,0 +1,11 @@
+/// This example shows how to describe the adapter in use.
+fn main() {
+    env_logger::init();
+
+    let adapter = wgpu::Adapter::request(&wgpu::RequestAdapterOptions {
+        power_preference: wgpu::PowerPreference::Default,
+        backends: wgpu::BackendBit::PRIMARY,
+    }).unwrap();
+
+    println!("{:?}", adapter.get_info())
+}