Switch to a library and move main to an example

examples/basic/main.rs

@@ -0,0 +1,28 @@
+use obd2::Obd2Device;
+
+use std::time;
+
+fn main() {
+    env_logger::init();
+    let mut device: obd2::Obd2<obd2::device::Elm327> = obd2::Obd2::default();
+
+    println!("VIN: {:?}", device.get_vin());
+    println!("DTC Info: {:#?}", device.get_dtc_info());
+
+    let dtcs = device.get_dtcs();
+    println!("DTCs: {:?}", dtcs);
+    if let Ok(dtcs) = dtcs {
+        for (i, response) in dtcs.iter().enumerate() {
+            println!("DTCs from response {}:", i);
+            for dtc in response {
+                println!("  - {}", dtc);
+            }
+        }
+    }
+
+    let state = time::Instant::now();
+    while state.elapsed() < time::Duration::from_secs(5) {
+        println!("RPM: {:?}", device.get_rpm());
+        println!("Speed: {:?}", device.get_speed());
+    }
+}