Add AUR link

Author: cbrnr

README.md

@@ -8,6 +8,8 @@ SigViewer is an application for viewing biosignals such as EEG or MEG time serie
 - [SigViewer 0.7.1 (Linux AARCH64)](https://github.com/cbrnr/sigviewer/releases/download/v0.7.1/sigviewer-0.7.1-linux-aarch64.tar.gz)
 - [SigViewer 0.7.1 (Source)](https://github.com/cbrnr/sigviewer/archive/v0.7.1.zip)
 
+Arch Linux users can install SigViewer from the AUR: [sigviewer](https://aur.archlinux.org/packages/sigviewer/).
+
 
 ## Building SigViewer