add node_modules to address #4364

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+# Encoding
+
+**encoding** is a simple wrapper around [node-iconv](https://github.com/bnoordhuis/node-iconv) and [iconv-lite](https://github.com/ashtuchkin/iconv-lite/) to convert strings from one encoding to another. If node-iconv is not available for some reason,
+iconv-lite will be used instead of it as a fallback.
+
+[![Build Status](https://secure.travis-ci.org/andris9/encoding.svg)](http://travis-ci.org/andris9/Nodemailer)
+[![npm version](https://badge.fury.io/js/encoding.svg)](http://badge.fury.io/js/encoding)
+
+## Install
+
+Install through npm
+
+    npm install encoding
+
+## Usage
+
+Require the module
+
+    var encoding = require("encoding");
+
+Convert with encoding.convert()
+
+    var resultBuffer = encoding.convert(text, toCharset, fromCharset);
+
+Where
+
+  * **text** is either a Buffer or a String to be converted
+  * **toCharset** is the characterset to convert the string
+  * **fromCharset** (*optional*, defaults to UTF-8) is the source charset
+
+Output of the conversion is always a Buffer object.
+
+Example
+
+    var result = encoding.convert("ÕÄÖÜ", "Latin_1");
+    console.log(result); //<Buffer d5 c4 d6 dc>
+
+## iconv support
+
+By default only iconv-lite is bundled. If you need node-iconv support, you need to add it
+as an additional dependency for your project:
+
+    ...,
+    "dependencies":{
+        "encoding": "*",
+        "iconv": "*"
+    },
+    ...
+
+## License
+
+**MIT**