add CentOS support (#9)

CHANGELOG.md

@@ -1,6 +1,10 @@
 Changelog
 ---------
 
+**3.2.0**
+
+- add support for RHEL/CentOS (contribution by ahanselka)
+
 **3.1.0**
 
 - pass package list directly to some modules by using the new and prefered syntax instead `loop` or `with_items` (contribution by ahanselka)

tasks/setup-centos.yml

@@ -0,0 +1,11 @@
+---
+
+- name: Add WireGuard repository
+  get_url:
+    url: https://copr.fedorainfracloud.org/coprs/jdoss/wireguard/repo/epel-7/jdoss-wireguard-epel-7.repo
+    dest: /etc/yum.repos.d/wireguard.repo
+
+- name: Install EPEL repository
+  yum:
+    name: epel-release
+    update_cache: yes