add readme

README.md

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+# Encoding Helper
+
+Converting strings between different encodings
+
+## Usage
+
+```js
+const encoding = require('@scode/encoding-helper');
+
+const hex = encoding.to_hex('abc'); // convert any encoding to hex, default is utf-8
+const b64 = encoding.to_b64(hex, 'hex'); // convert any encoding to base64, default is utf-8
+const utf8 = encoding.to_utf8(hex, 'hex'); // convert any encoding to utf-8, no default
+```