Improve docs for starting from scratch

Author: lkocman

Diff for: README.md

@@ -3,6 +3,10 @@ Website promoting the openSUSE distribution development effort, explaining what
 
 ## How to build?
 
+```bash
+sudo zypper in ruby3.4-devel ruby3.4-rubygem-bundler gcc-c++
+```
+
 ```bash
 bundle install --path vendor/bundle
 bundle exec rake