Merge pull request #18 from EESSI/deps_readme

Note about 'become' functionality in Ansible

Author: boegel

README.md

@@ -25,6 +25,8 @@ The CVMFS layer of the EESSI project consists of the usual CVMFS infrastructure:
 The main prerequisite is Ansible (https://github.com/ansible/ansible),
 which can be easily installed via the package manager of most Linux distributions or via `pip install`.
 For more details, see the Ansible installation guide: https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html.
+Note that Ansible needs to be able to log in to the remote machines where you want to install some CVMFS component,
+and needs to be able to use privilege escalation (e.g. `sudo`) on those machines to execute tasks with root permission.
 
 For the installation of all components we make use of two Ansible roles: the CVMFS installation role provided by the Galaxy project (see
 https://github.com/galaxyproject/ansible-cvmfs), and a role for adding the EPEL repository (https://github.com/geerlingguy/ansible-role-repo-epel).