Updated NestLogged (markdown)

NestLogged.md

@@ -4,3 +4,19 @@ This package provides a set of decorators can be used for logging functions and
 
 If you want to start quickly, go to [Quickstart](https://github.com/Worplo/nestlogged/wiki/quickstart).  
 If you want to learn things or how decorators work, then just browse this wiki page by page.
+
+# Installation
+
+[This package is published in npm](https://www.npmjs.com/package/nestlogged).
+
+You can install this package using the package managers:
+
+```sh
+npm install nestlogged
+```
+
+Or,
+
+```sh
+yarn add nestlogged
+```