Add authors and contributors files.

Change-Id: I192d8fe104c3734c9c37108312f1dc93470d8d9e
Reviewed-on: https://swiftshader-review.googlesource.com/5342
Reviewed-by: Shannon Woods <shannonwoods@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/AUTHORS.txt b/AUTHORS.txt
new file mode 100644
index 0000000..faa8822
--- /dev/null
+++ b/AUTHORS.txt
@@ -0,0 +1,9 @@
+# This is the official list of SwiftShader authors for copyright purposes.

+# This file is distinct from the CONTRIBUTORS files.

+# See the latter for an explanation.

+# Names should be added to this file as:

+# Name or Organization <email address>

+# The email address is not required for organizations.

+

+Google Inc.

+The ANGLE Project Authors <angleproject@googlegroups.com>
\ No newline at end of file