Add technology-specific README files

Add README.md files for specific technology areas (Ansible, CentOS Atomic Host, Consul, CoreOS, Debian, Docker, and etcd).

Signed-off-by: Scott Lowe <scott.lowe@scottlowe.org>

ansible/README.md

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+# Learning Tools: Ansible
+
+This folder contains tools, resources, and examples to help with learning how to use Ansible in a variety of environments and for a variety of use cases.
+
+## Contents
+
+**ansible-aws**: This set of files shows how to use Ansible to both provision infrastructure on AWS as well as how to decommission (tear down) that same infrastructure.

centos-atomic/README.md

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+# Learning Tools: CentOS Atomic Host
+
+Everything in this folder is focused around CentOS Atomic Host.
+
+## Contents
+
+**docker-tcp**: This folder is about customizing the behavior and configuration of the Docker Engine daemon on CentOS Atomic Host, but without modifying the built-in systemd unit file(s).

consul/README.md

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+# Learning Tools: Consul Distributed Key-Value Store
+
+The contents of this folder and its subfolders are centered around the installation or configuration of the Consul distributed key-value store.
+
+## Contents
+
+**consul-ansible**: In this folder you'll find a `Vagrantfile` and supporting documents to run a Consul cluster under Vagrant on your local laptop. The provisioning is handled via Ansible (pre-2.0) installed on the Vagrant host.
+
+**consul**: In this folder you'll find a `Vagrantfile` and supporting documents to run a Consul cluster under Vagrant on your local laptop. The  provisioning is handled via shell scripts.

coreos/README.md

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+# Learning Tools: CoreOS Linux
+
+Here you'll find Vagrant environments and other resources for learning more about CoreOS.
+
+## Contents
+
+**cloudinit-toolbox**: This folder contains files for using cloud-init to customize the CoreOS toolbox. This learning environment can be used with local Vagrant VMs, with OpenStack instances, or with AWS instances.

debian/README.md

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+# Learning Tools: Debian GNU/Linux
+
+Here you'll find Vagrant environments and other resources for learning more about CoreOS.
+
+## Contents
+
+**debian-generic**: This folder has a Vagrant environment for spinning up a generic, 64-bit Debian 8.0 ("Jessie") VM. Note there's nothing special here---just a plain, generic Debian VM. No custom provisioning is provided in this environment.

docker/README.md

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+# Learning Tools: Docker
+
+Here you'll find a collection of tools and resources for learning about (or experimenting with) Docker and Docker containers.
+
+## Contents
+
+**containerd-runc**: _This is a placeholder for future work._
+
+**ipvlan-l2**: This folder has files to create a learning environment for using ipvlan interfaces with Docker containers.
+
+**ipvlan-l3**: This folder has files to create a learning environment for using ipvlan L3 interfaces with Docker containers.
+
+**ipvs**: Use this learning environment to experiment with using IPVS/LVS for load balancing Docker containers.
+
+**macvlan**: This folder has files to create a learning environment for using macvlan interfaces with Docker containers.
+
+**swarm-consul**: This folder contains a `Vagrantfile` and supporting files to run a Consul-backed Docker Swarm cluster under Vagrant on your local system. The provisioning is handled via shell scripts.
+
+**swarm-etcd**: In this folder is a `Vagrantfile` and supporting files for turning up an etcd 2.0-backed Docker Swarm cluster. The provisioning is handled via shell scripts.
+
+**swarm-etcd2-photon:** This folder contains a Vagrant environment and associated support files to turn up an etcd-backed Docker Swarm cluster where the Docker Engine instances are running on VMware Photon. Provisioning is handled by Ansible 2.x.
+
+**swarm-ha**: This folder holds a `Vagrantfile`, supporting files, and instructions for turning up a Consul-backed Docker Swarm cluster with multiple Swarm managers for high availability. The provisioning is handled via shell scripts.

etcd/README.md

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+# Learning Tools: etcd Distributed Key-Value Store
+
+In this folder are environments, tools, resources, and the like for learning more about etcd, the distributed key-value store.
+
+## Contents
+
+**etcd-2.0**: Use the `Vagrantfile` and other files in this directory to turn up an etcd 2.0.9 cluster running on Ubuntu 14.04. The provisioning is handled via shell scripts.