Add usage and examples in readme

README.md

@@ -1,3 +1,31 @@
-Like `chmod -R`.
+## Description
+Has the same effect as the command line command: `chmod -R`.
 
-Takes the same arguments as `fs.chmod()`
+## Install
+
+```
+npm i --save chmodr
+```
+
+## Usage
+
+Takes the same arguments as [`fs.chmod()`](https://nodejs.org/api/fs.html#fs_fs_chmod_path_mode_callback)
+
+chmodr(path, mode, callback)
+* path `<string>` | `<Buffer>` | `<URL>`
+* mode `<integer>`
+* callback `<Function>`
+    * err `<Error>`
+
+## Example
+```javascript
+var chmodr = require('chmodr');
+
+chmodr('/var/www/my/test/folder', 0o777, (err) => {
+  if (err) {
+    console.log('Failed to execute chmod', err);
+  } else {
+    console.log('Success');
+  }
+});
+```