Update README.md (#304)

* Update README.md

Added steps to describe how we put together deb and rpms in the README file.

Fixes #117

* Updated README

Addressed the changes by providing the correct link.

Fixes #117

README.md

@@ -4,8 +4,7 @@ Repository for creating installable packages for AdoptOpenJDK releases.
 The packages are created using:
 1. The Wix Toolset http://wixtoolset.org (Windows only)
 2. [Packages](http://s.sudre.free.fr/Software/Packages/about.html) (Mac OS)
-3. ??? (Linux .deb)
-4. ??? (Linux .rpm)
+3. For putting together `.deb` and `rpms` head to this link: [linux subdir readme](https://github.com/adoptium/installer/tree/master/linux#readme)
 
 The available packages can be seen from the AdoptOpenJDK download pages: https://adoptopenjdk.net/releases.html.