Add example that prints generated keys

examples/generate.rs

@@ -0,0 +1,25 @@
+use failure::Error;
+use rsa::RSAPrivateKey;
+use rsa_pem::KeyExt;
+
+fn main() -> Result<(), Error> {
+    let mut rng = rand::thread_rng();
+
+    let key = RSAPrivateKey::new(&mut rng, 2048)?;
+
+    println!("PKCS1 - Private");
+    println!("{}", key.to_pem_pkcs1()?);
+    println!();
+    println!("PKCS8 - Private");
+    println!("{}", key.to_pem_pkcs8()?);
+
+    let key = key.to_public_key();
+
+    println!("PKCS1 - Public");
+    println!("{}", key.to_pem_pkcs1()?);
+    println!();
+    println!("PKCS8 - Public");
+    println!("{}", key.to_pem_pkcs8()?);
+
+    Ok(())
+}