docs: Add README

- Overview
- Terms

Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>

README.md

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+# Overview #
+
+`Kata Containers runtime` creates a Virtual Machine to isolate a set of
+container workloads. The Virtual Machine requires a operating system
+operating (`Guest OS`) to boot and create containers inside the guest
+environment.
+
+This repository contains tools to create a `Guest OS` for `Kata
+Containers`.
+
+## Terms ##
+
+This section describe the terms used as along all this document.
+
+- `Guest OS`
+
+ It is the collection of a `virtual disk` or `disk image` and `kernel`
+ that in conjunction work as an operating system and it is different than
+ the host operating system.
+
+ - `Virtual disk` or `Guest Image`
+
+ It is a virtual disk witch contains a `rootfs` that will be used to boot
+ a Virtual Machine by for the `Kata Containers runtime`.
+
+ - `rootfs`
+
+  The root filesystem or rootfs is the filesystem that is contained in the
+  guest root directory. It can be built from any Linux Distribution but
+  must provide at least the following components:
+	- Kata agent
+	- A `init` system (for example `systemd`) witch allow to start
+	  Kata agent at boot time.