top: Add CONTRIBUTORS.md file

We add CONTRIBUTORS.md file to provide a list of individuals and
organizations actively contributing to the OpenSBI project.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

CONTRIBUTORS.md

@@ -0,0 +1,7 @@
+
+List of OpenSBI Contributors (Alphabetically sorted)
+====================================================
+
+* **[Western Digital Corporation](https://www.wdc.com/)**
+  * Project initiator and maintainer
+  * Copyright (c) 2019 Western Digital Corporation or its affiliates

COPYING.BSD

@@ -1,7 +1,8 @@
 The 2-Clause BSD License
 SPDX short identifier: BSD-2-Clause
 
-Copyright (c) 2019 Western Digital Corporation or its affiliates.
+Copyright (c) 2019 Western Digital Corporation or its affiliates and other
+contributors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -22,4 +23,3 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-

README.md

@@ -157,7 +157,7 @@ files where the reused code is present.
 2. Some source file for the Kendryte/k210 platform code are based on code from
    the Kendryte [standalone SDK] available on github. These files retain the
    original copyright and license of the Kendryte standalone SDK project and
-   are licensed under the terms of the Apache License, Version 2.0. 
+   are licensed under the terms of the Apache License, Version 2.0.
 
 See also the [third party notices] file for more information.
 
@@ -168,6 +168,9 @@ The OpenSBI project encourages and welcomes contributions. Contributions should
 follow the rules described in OpenSBI [Contribution Guideline] document.
 In particular, all patches sent should contain a Signed-off-by tag.
 
+The [Contributors List] document provides a list of individuals and
+organizations actively contributing to the OpenSBI project.
+
 Documentation
 -------------
 
@@ -226,6 +229,7 @@ make I=<install_directory> install_docs
 [COPYING.BSD]: COPYING.BSD
 [SPDX]: http://spdx.org/licenses/
 [Contribution Guideline]: docs/contributing.md
+[Contributors List]: CONTRIBUTORS.md
 [Library Usage]: docs/library_usage.md
 [Platform Support Guide]: docs/platform_guide.md
 [Platform Documentation]: docs/platform/platform.md
@@ -233,4 +237,3 @@ make I=<install_directory> install_docs
 [Doxygen manual]: http://www.stack.nl/~dimitri/doxygen/manual.html
 [standalone SDK]: https://github.com/kendryte/kendryte-standalone-sdk
 [third party notices]: ThirdPartyNotices.md
-