link installers also for users

Signed-off-by: Christoph Rueger <chrisrueger@gmail.com>

Author: chrisrueger

installation.md

@@ -8,6 +8,7 @@ There are different flavors you can install Bndtools.
 
 - via the [Eclipse Marketplace](#marketplace)
 - or directly install into Eclipse from the [Update Site](#update-site) 
+- another option are [pre-configured Eclipse setups via installer](https://bndtools.org/bndtools.p2.repo/)
 
 ## Developers: If you want to contribute to bndtools