updated readme

README.md

@@ -1,2 +1,29 @@
+![Crates.io](https://img.shields.io/crates/v/libpefile?style=plastic)
+
 # libpefile
+
 library to parse PE files
+
+## Installation
+
+```
+cargo install libpefile
+```
+
+## Usage example
+
+```rust
+use libpefile::*;
+use std::path::PathBuf;
+
+fn main() -> std::io::Result<()> {
+    let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    let dll_file = PathBuf::from(format!("{}/samples/msaudite.dll", manifest_dir));
+    let pefile = PEFile::new(dll_file)?;
+
+    for msg in pefile.messages_iter()? {
+        println!("{}: '{}'", msg.msg_id, msg.text);
+    }
+    Ok(())
+}
+```