Add rust implementation

src/bots/approved_bot/modules/help.rs

@@ -0,0 +1,45 @@
+use crate::bots::BotHandlerInternal;
+
+use teloxide::{prelude::*, utils::command::BotCommands};
+
+#[derive(BotCommands, Clone)]
+#[command(rename = "lowercase")]
+enum HelpCommand {
+    Start,
+    Help,
+}
+
+pub async fn help_handler(message: Message, bot: AutoSend<Bot>) -> BotHandlerInternal {
+    let name = message
+        .from()
+        .map(|user| user.first_name.clone())
+        .unwrap_or("пользователь".to_string());
+
+    match bot
+        .send_message(
+            message.chat.id,
+            format!(
+                "
+Привет, {name}! \n
+Этот бот поможет тебе загружать книги.\n
+Настройки языков для поиска /settings.\n
+        "
+            ),
+        )
+        .send()
+        .await
+    {
+        Ok(_) => Ok(()),
+        Err(err) => Err(Box::new(err)),
+    }
+}
+
+pub fn get_help_handler() -> crate::bots::BotHandler {
+    dptree::entry().branch(
+        Update::filter_message().branch(
+            dptree::entry()
+                .filter_command::<HelpCommand>()
+                .endpoint(|message, bot| async move { help_handler(message, bot).await }),
+        ),
+    )
+}