Add Google example

examples/google.rs

@@ -0,0 +1,19 @@
+extern crate inth_oauth2;
+
+use inth_oauth2::Client;
+
+fn main() {
+    let client = Client {
+        authorization_uri: String::from("https://accounts.google.com/o/oauth2/auth"),
+        client_id: String::from("143225766783-ip2d9qv6sdr37276t77luk6f7bhd6bj5.apps.googleusercontent.com"),
+        client_secret: String::from("3kZ5WomzHFlN2f_XbhkyPd3o"),
+        redirect_uri: Some(String::from("urn:ietf:wg:oauth:2.0:oob")),
+    };
+
+    let auth_uri = client.authorization_uri(
+        Some("https://www.googleapis.com/auth/userinfo.email"),
+        None
+    ).unwrap();
+
+    println!("{}", auth_uri);
+}