XDS install and create app: New files and content.

Change-Id: I8021d3096e546bb0bb77a272dd5bcb0ea4dbf209
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>

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+# Overview
+
+X(cross) Development System (XDS) is set of tools that provides
+multi-platform cross development with
+[near-zero](https://en.wikipedia.org/wiki/Zero_Install)
+installation.
+
+This guide is available in two forms: the online version and a PDF
+version:
+
+- Online: [http://docs.automotivelinux.org/docs/en/master/devguides/#xcross-development-system-user's-guide](../../../#xcross-development-system-user's-guide)
+
+- PDF: [http://iot.bzh/download/public/XDS/docs/XDS_UsersGuide.pdf](http://iot.bzh/download/public/XDS/docs/XDS_UsersGuide.pdf)
+
+XDS has two goals:
+
+1. Provide a multi-platform, cross development
+tool with near-zero installation.
+
+2. Keep application source files local to the user's machine, which
+   makes XDS compatible with existing IT policies
+   (e.g. corporate backup or SCM), and lets users continue to work
+   using their favorite editors all while keeping performance during
+   editing and browsing activities.
+
+The following illustration shows XDS as two functional blocks:
+the client part and the server part.
+
+The client part consists of several tools some essential and some
+required.
+The client part must have `xds-agent` and can optionally have `xds-cli`
+and `xds-gdb`.
+The client part runs on the user's machine (Development Host).
+
+The server part (`xds-server`) can run anywhere in a container,
+which includes a standalone machine, a server machine connected
+through a local network, or a server machine connected through the Cloud.
+
+![](./pictures/xds-block-diagram.png){:: style="width:98%;"}
+
+<!-- pagebreak -->
+
+The client part is portable and can run on the following platforms:
+
+- Linux
+- Windows
+- MacOS
+
+The following figure shows the three supported configurations for the client part:
+
+- standalone (i.e. local)
+- On-Premise, which uses a local network
+- [Software as a Service](https://en.wikipedia.org/wiki/Software_as_a_service)
+  (SaaS), which is Cloud-based
+
+![](./pictures/xds-conf.png){:: style="width:98%;"}