Add README.md

README.md

+# Deploy monitoring plugins from packages and/or a git repository
+
+
+# Usage
+
+icinga2_plugins_repos:
+  - key_name: my_icinga_plugins
+    key_source: /etc/ansible/files/keys
+    key_destination: /root/.ssh
+    git_repo: ssh://git@gitlab.example.net/my/icinga-plugins.git
+    git_destination: /usr/lib/nagios/plugins/my
+