fix README

README.md

@@ -1,3 +1,6 @@
+Table of contents
+=================
+
 <!--ts-->
    * [Prerequisites](#prerequisites)
    * [Setup](#setup)
@@ -67,13 +70,17 @@ this playbok will:
 
 Run optionals
 =============
-- docker.yml : installs docker-ce and docker-compose (variable in variables.yml for latest of docker-compose)
-- lldp.yml : installs and enables LLDP
+- docker.yml
+  - installs docker-ce and docker-compose (variable in variables.yml for latest of docker-compose)
+- lldp.yml
+  - installs and enables LLDP
 - telegraf.yml
 - tincvpn.yml
 - transmission.yml
-- singularity.yml : installs go and builds and installs singularity
-- tor.yml : installs tor base from tor repo
+- singularity.yml
+  - installs go and builds and installs singularity
+- tor.yml
+  - installs tor base from tor repo
 
 Versions
 ========
@@ -99,3 +106,4 @@ or:
 TODO
 ========
 - [ ] fix the installation that is only for deb systems in common.yml
+- [ ] test on centos