add simple readme

Author: jvllmr

README.md

@@ -0,0 +1,29 @@
+# rustpython-unparser
+
+> [!IMPORTANT]
+> rustpython-unparser is in early development and WIP.
+
+A complete unparser for rustpython-parser ASTs.
+
+
+## Simple usage example
+
+```rust
+use rustpython_unparser::Unparser;
+use rustpython_parser::ast::Suite;
+use rustpython_parser::Parse;
+use std::fs;
+fn main() {
+    // ...
+    let unparser = Unparser::new();
+    let stmts = Suite::parse(source_str, file_path);
+    for stmt in &stmts {
+        unparser.unparse_stmt(stmt);
+    }
+    let new_source = unparser.source;
+    // ...
+}
+
+
+
+```

src/lib.rs

@@ -1,13 +1,13 @@
 pub mod unparser;
 
+pub use crate::unparser::Unparser;
+
 #[cfg(test)]
 mod tests {
-
+    use super::*;
     use rustpython_parser::ast::Suite;
     use rustpython_parser::Parse;
 
-    use crate::unparser::Unparser;
-
     use std::fs;
     use std::io;
     use std::path::Path;