Add ping_bot example

.gitignore

@@ -1,4 +1,6 @@
 /target
 **/*.rs.bk
 Cargo.lock
-.idea/
+.idea/
+.vscode/
+examples/target

examples/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "examples"
+version = "0.0.0"
+publish = false
+edition = "2018"
+
+[dev-dependencies]
+teloxide = { path = "../" }
+tokio = "0.2.6"
+pretty_env_logger = "0.3"
+futures = "0.3.1"
+log = "0.4.8"
+
+[[example]]
+name = "ping_bot"
+path = "ping_bot.rs"

examples/README.md

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+# Examples of how to use Teloxide.
+
+All examples can be executed with:
+
+```
+cargo run --example $name
+```
+
+If you've got an example you'd like to see here, please feel free to open an issue. Otherwise if you've got an example you'd like to add, please feel free to make a PR!

examples/ping_bot.rs

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+use futures::stream::StreamExt;
+use teloxide::{
+    dispatching::{
+        private::Dispatcher, update_listeners::polling_default, SessionState,
+    },
+    requests::Request,
+    types::{Message, Update, UpdateKind},
+    Bot,
+};
+
+extern crate pretty_env_logger;
+#[macro_use]
+extern crate log;
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+    let bot = &Bot::new("1061598315:AAErEDodTsrqD3UxA_EvFyEfXbKA6DT25G0");
+    let mut updater = Box::pin(polling_default(bot));
+    let handler = |s, upd: Update| async move {
+        match upd.kind {
+            UpdateKind::Message(m) => {
+                if m.text() == "ping" {
+                    let msg = bot.send_message(m.chat.id, "pong");
+                }
+                msg.send().await.unwrap();
+            }
+            _ => {}
+        }
+        SessionState::Continue(s)
+    };
+    let mut dp = Dispatcher::<'_, (), _>::new(handler);
+    info!("Starting the message handler.");
+    loop {
+        let u = updater.next().await.unwrap();
+        match u {
+            Err(e) => error!("{}", e),
+            Ok(u) => {
+                let _ = dp.dispatch(u).await;
+            }
+        }
+    }
+}