eng: Rework preface and add mission statement

Add mission statement based on the wiki page:

https://devel.rtems.org/wiki/Mission_Statement

Do format changes and some rewording.

eng/index.rst

@@ -24,6 +24,7 @@ RTEMS Software Engineering (|version|)
     :numbered:
 
     preface
+    mission
     prequalification
     stakeholders
     management

eng/license-requirements.rst

@@ -3,6 +3,7 @@
 .. Copyright (C) 2018.
 .. COMMENT: RTEMS Foundation, The RTEMS Documentation Project
 
+.. _LicensingRequirements:
 
 Licensing Requirements
 **********************

eng/mission.rst

@@ -0,0 +1,75 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 2020 embedded brains GmbH
+.. Copyright (C) 2015 Chris Johns
+.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+
+RTEMS Project Mission Statement
+*******************************
+
+RTEMS development done under the umbrella of the RTEMS Project aims to provide a
+free and open real-time operating system targeted towards deeply embedded
+systems which is competitive with proprietary products.  The RTEMS Project
+encourages the support and use of standard APIs in order to promote application
+portability and ease porting other packages to the RTEMS environment.
+
+The RTEMS development effort uses an open development environment in which all
+users collaborate to improve RTEMS. The RTEMS cross development tool suite is
+based upon the free GNU tools and the open source standard C library newlib.
+RTEMS supports many host platforms and target architectures.
+
+Free Software Project
+=====================
+
+The free software goals of the project are:
+
+* RTEMS and supporting components are available under various free licenses with
+  copyrights being held by individual authors.
+
+* All software which executes on the target will not place undue restrictions on
+  embedded applications.  See also :ref:`LicensingRequirements`.
+
+* Patches must be legally acceptable for inclusion into the RTEMS Project or the
+  specific project being used.
+
+Design and Development Goals
+============================
+
+* Source based development with all users building from source
+
+* Any suitable host should be supported
+
+* Open testing, tests and test results
+
+* Ports to new architectures and CPU models
+
+* Addition of Board Support Packages for available hardware
+
+* Improved runtime libraries
+
+* Faster debug cycle
+
+* Various other infrastructure improvements
+
+Open Development Environment
+============================
+
+* Encourage cooperation and communication between developers
+
+* Work more closely with "consumers"
+
+* Code available to everyone at any time, and everyone is welcome to participate
+  in development
+
+* Patches will be considered equally based on their technical merits
+
+* All individuals and companies are welcome to contribute as long as they accept
+  the ground rules
+
+* Open mailing lists
+
+* Developer friendly tools and procedures with a focus on keeping them current
+
+* Conflicts of interest exist for many RTEMS developers. The developers
+  contributing to the RTEMS Project must put the interests of the RTEMS Project
+  first.

eng/preface.rst

@@ -1,29 +1,12 @@
 .. SPDX-License-Identifier: CC-BY-SA-4.0
 
-.. Copyright (C) 2018.
+.. Copyright (C) 2020 embedded brains GmbH
-.. COMMENT: RTEMS Foundation, The RTEMS Documentation Project
 
 Preface
 *******
 
-The Real Time Executive for Multiprocessor Systems (RTEMS) operating
+This manual aims to guide the development of RTEMS itself.  You should read this
-systems is a layered system with each of the public APIs implemented in
+document if you want to participate in the development of RTEMS.  Users of RTEMS
-terms of a common foundation layer called the SuperCore. RTEMS provides
+may find background information in this manual.  Please refer to the
-full capabilities for management of tasks, interrupts time, and multiple
+:r:url:`user` and :r:url:`c-user` if you want to know how the RTEMS development
-processors in addition to those features typical of generic operating
+environment is set up and how you can develop applications using RTEMS.
-systems. RTEMS has been implemented in both the Ada and C programming
-languages.
-
-.. topic: RTEMS Mission Statement
-
-  RTEMS development aims to provide a free deterministic real-time operating
-  system targeted towards deeply embedded systems which is competitive
-  with closed source products. The RTEMS project encourages the support
-  and use of standard APIs in order to promote application portability
-  and ease porting other packages to the RTEMS environment. Source:
-  https://devel.rtems.org/wiki/Mission_Statement
-
-The RTEMS development effort uses an open development environment in
-which all users collaborate to improve RTEMS. The RTEMS cross development
-toolset is based upon the free GNU tools and the open source C Library
-newlib. RTEMS supports many host platforms and target architectures.