feat: add readme

README.md

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+# Theb.ai / BAI Chat 
+
+## Installation
+
+``` shell
+cargo add baichat-rs
+```
+
+## Usage
+
+``` rust
+extern crate baichat_rs;
+
+use baichat_rs::ThebAI;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+
+    let mut ai = ThebAI::new(None);
+    
+    let r = ai.ask("Hello, world!", None).await?;
+
+    let response = r[r.len() - 1].text.clone();
+
+    println!("{}", response);
+
+    Ok(())
+}
+```