feat: add authentication example with user certificates (#214)

Author: w1am

examples/Cargo.toml

@@ -39,3 +39,8 @@ crate-type = ["staticlib"]
 name = "persistent_subscriptions"
 path = "persistent_subscriptions.rs"
 crate-type = ["staticlib"]
+
+[[example]]
+name = "user_certificates"
+path = "user_certificates.rs"
+crate-type = ["staticlib"]

examples/user_certificates.rs

@@ -0,0 +1,19 @@
+#![allow(unused_attributes)]
+#![allow(unused_imports)]
+#![allow(unused_results)]
+#![allow(unused_variables)]
+#![allow(unreachable_code)]
+
+use std::error::Error;
+use kurrentdb::Client;
+
+type Result<A> = std::result::Result<A, Box<dyn Error>>;
+
+pub async fn user_certificates() -> Result<()> {
+    // region client-with-user-certificates
+    let settings = "kurrentdb://admin:changeit@{endpoint}?tls=true&userCertFile={pathToCaFile}&userKeyFile={pathToKeyFile}".parse()?;
+    let client = Client::new(settings)?;
+    // endregion client-with-user-certificates
+
+    Ok(())
+}