doc: add project README

Simplify the previous README and add more information about project
resources.

Fixes: #144

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

README.rst

@@ -0,0 +1,75 @@
+Project ACRN Embedded Hypervisor
+################################
+
+
+The open source project ACRN defines a device hypervisor reference stack
+and an architecture for running multiple software subsystems, managed
+securely, on a consolidated system by means of a virtual machine
+manager. It also defines a reference framework implementation for
+virtual device emulation, called the "ACRN Device Model".
+
+The ACRN Hypervisor is a Type 1 reference hypervisor stack, running
+directly on the bare-metal hardware, and is suitable for a variety of
+IoT and embedded device solutions. The ACRN hypervisor addresses the
+gap that currently exists between datacenter hypervisors, and hard
+partitioning hypervisors. The ACRN hypervisor architecture partitions
+the system into different functional domains, with carefully selected
+guest OS sharing optimizations for IoT and embedded devices.
+
+.. start_include_here
+
+Community Support
+*****************
+
+The Project ACRN Developer Community includes developers from member
+organizations and the general community all joining in the development of
+software within the project. Members contribute and discuss ideas,
+submit bugs and bug fixes. They also help those in need
+through the community's forums such as mailing lists and IRC channels. Anyone
+can join the developer community and the community is always willing to help
+its members and the User Community to get the most out of Project ACRN.
+
+Welcome to the project ARCN community!
+
+Resources
+*********
+
+Here's a quick summary of resources to find your way around the Project
+ACRN support systems:
+
+* **Project ACRN Website**: The https://projectacrn.org website is the
+  central source of information about the project. On this site, you'll
+  find background and current information about the project as well as
+  relevant links to project material.  For a quick start, refer to the
+  `Introduction`_ and `Getting Started Guide`_.
+
+* **Source Code in GitHub**: Project ACRN source code is maintained on a
+  public GitHub repository at https://github.com/projectacrn/acrn-hypervisor.
+  You'll find information about getting access to the repository and how to
+  contribute to the project in this `Contribution Guide`_ document.
+
+* **Documentation**: Project technical documentation is developed
+  along with the project's code, and can be found at
+  https://projectacrn.github.io.  Additional documentation is maintained in
+  the `Project ACRN GitHub wiki`_.
+
+* **Issue Reporting and Tracking**: Requirements and Issue tracking is done in
+  the Github issues system: https://github.com/projectacrn/acrn-hypervisor/issues.
+  You can browse through the reported issues and submit issues of your own.
+
+* **Mailing List**: The `Project ACRN Development mailing list`_ is perhaps the most convenient
+  way to track developer discussions and to ask your own support questions to
+  the project ACRN community.  There are also specific `ACRN mailing list
+  subgroups`_ for builds, users, and Technical
+  Steering Committee notes, for example.
+  You can read through the message archives to follow
+  past posts and discussions, a good thing to do to discover more about the
+  project.
+
+
+.. _Introduction: https://projectacrn.github.io/latest/introduction/
+.. _Getting Started Guide: https://projectacrn.github.io/latest/getting_started/
+.. _Contribution Guide: https://projectacrn.github.io/latest/contribute.html
+.. _Project ACRN GitHub wiki: https://github.com/projectacrn/acrn-hypervisor/wiki
+.. _Project ACRN Development mailing list: https://lists.projectacrn.org/g/acrn-dev
+.. _ACRN mailing list subgroups: https://lists.projectacrn.org/g/main/subgroups