add a readme

README.md

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+# Advanced features/aspects of Ansible
+
+This repository is a collection of playbooks showing advanced features or
+aspects of Ansible.
+
+## Current examples
+
+[Variable evaluation order](variable-order.yaml): shows that Jinja placeholders
+in the variable value are evaluated when used and not when defined.
+
+[Select filter and search test](select-filter-and-search-test.yaml): shows how
+to combine the `select` filter of Jinja with the `match`/`search` test of 
+Ansible to filter a list.