added part of getting started

README.md

@@ -16,3 +16,61 @@
   
   A full-featured framework that empowers you to easily build [Telegram bots](https://telegram.org/blog/bot-revolution) using the [`async`/`.await`](https://rust-lang.github.io/async-book/01_getting_started/01_chapter.html) syntax in [Rust](https://www.rust-lang.org/). It handles all the difficult stuff so you can focus only on your business logic.
 </div>
+
+# Getting started
+
+Library requires rustc version more than 1.40.0. You can check your rustc version with command:
+```shell script
+rustup -V
+```
+If your rustc version lower than 1.40.0, update it with:
+```shell script
+rustup update stable
+```
+Than create Cargo project and write
+```toml
+teloxide = "0.1.0"
+```
+in your Cargo.toml file.
+
+### Writing first bot
+First, create bot with [@botfather](https://t.me/botfather). After creating, botfather give you
+token in format `123456789:somemanyletters`.
+
+Next, open yout `main.rs` file. Let's create a simple echo bot:
+```rust
+use futures::stream::StreamExt;
+use teloxide::{
+    dispatching::{
+        chat::{ChatUpdate, ChatUpdateKind, Dispatcher},
+        update_listeners::polling_default,
+        SessionState,
+    },
+    requests::Request,
+    Bot,
+};
+
+#[tokio::main]
+async fn main() {
+    let bot = &Bot::new("1061598315:AAErEDodTsrqD3UxA_EvFyEfXbKA6DT25G0");
+    let mut updater = Box::pin(polling_default(bot));
+    let handler = |_, upd: ChatUpdate| async move {
+        if let ChatUpdateKind::Message(m) = upd.kind {
+            let msg = bot.send_message(m.chat.id, m.text);
+            msg.send().await.unwrap();
+        }
+        SessionState::Continue(())
+    };
+    let mut dp = Dispatcher::<'_, (), _>::new(handler);
+    println!("Starting the message handler.");
+    loop {
+        let u = updater.next().await.unwrap();
+        match u {
+            Err(e) => eprintln!("Error: {}", e),
+            Ok(u) => {
+                let _ = dp.dispatch(u).await;
+            }
+        }
+    }
+}
+```