Added Installation and usage example into the REAMDE

Author: Manvel

README.md

@@ -1,19 +1,33 @@
 # markdown-it-html-entities
 
 Currently [markdown-it](https://github.com/markdown-it/markdown-it) follows
-[CommonMark specs](https://spec.commonmark.org) which requires HTML Entity
+[CommonMark specs](https://spec.commonmark.org) which requires HTML Entities
 [replacement with Unicode
-Character](https://spec.commonmark.org/0.28/#entity-references), though in the
-Browsers [HTML
-entities](https://developer.mozilla.org/en-US/docs/Glossary/Entity) are
-displayed using relevant characters.
+Characters](https://spec.commonmark.org/0.28/#entity-references) and currently
+there is no native way to disable [HTML
+Entities](https://developer.mozilla.org/en-US/docs/Glossary/Entity) autoconvertion.
 
-This plugin is for disabling the HTML Entities to Unicode convertion for
-markdown-it.
+This plugin disables the automatic HTML Entities to Unicode convertion in
+markdown-it and let the browser display expected character using HTML Entities
+accordingly, avoiding unexpected character convertion which might not play well
+if you would like to integrate the Markdown output with the system that expect
+HTML Entities and in general it's just adding support for using HTML Entities in
+the Markdown.
+
+## Installation
+
+```bash
+npm i markdown-it-html-entities
+```
 
 ## Usage
 
 ```js
-```
+const markdownIt = require("markdown-it");
+const htmlEntities = require("markdown-it-html-entities");
+
+const markdown = markdownIt().use(htmlEntities);
 
-## Example
+const result = markdown.render("curly { & } brackets");
+console.log(result); // <p>curly &#123; &amp; &#125; brackets</p>
+```