Add chatbot crate

crates/chatbot/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "chatbot"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { workspace = true }

crates/chatbot/src/lib.rs

@@ -0,0 +1,21 @@
+use std::time::Duration;
+use tokio::time::sleep;
+
+/// Generates a random `usize`.
+///
+/// Warning: may take a few seconds!
+pub async fn gen_random_number() -> usize {
+    sleep(Duration::from_secs(2)).await;
+    4
+}
+
+/// Generates a list of possible responses given the current chat.
+///
+/// Warning: may take a few seconds!
+pub async fn query_chat(_messages: &[String]) -> Vec<String> {
+    sleep(Duration::from_secs(2)).await;
+    vec![
+        "And how does that make you feel?".to_string(),
+        "Interesting! Go on...".to_string(),
+    ]
+}