Add Unix availability to README.md

Signed-off-by: Alex <61382599+NeffIsBack@users.noreply.github.com>

Author: NeffIsBack

README.md

@@ -43,6 +43,11 @@ sudo apt install pipx git
 pipx ensurepath
 pipx install git+https://github.com/Pennyw0rth/NetExec
 ```
+
+## Availability on other Unix distributions
+
+[![Packaging status](https://repology.org/badge/vertical-allrepos/netexec.svg)](https://repology.org/project/netexec/versions)
+
 # Development
 Development guidelines and recommendations in development