Add CONTRIBUTORS.txt

Author: adam-fowler

CONTRIBUTORS.txt

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+For the purpose of tracking copyright, this is the list of individuals and
+organizations who have contributed source code to Soto.
+
+For employees of an organization/company where the copyright of work done
+by employees of that company is held by the company itself, only the company
+needs to be listed here.
+
+## COPYRIGHT HOLDERS
+
+### Contributors
+
+- Adam Fowler <adamfowler71@gmail.com>
+- Michael Housh <m-housh@users.noreply.github.com>
+- Michal Šrůtek <35694712+michalsrutek@users.noreply.github.com>
+- Sean Patrick O'Brien <sean.patrick.obrien@me.com>
+- Sven A. Schmidt <sas@finestructure.co>
+
+**Updating this list**
+
+Please do not edit this file manually. It is generated using `./scripts/generate_contributors_list.sh`. If a name is misspelled or appearing multiple times: add an entry in `./.mailmap`

scripts/generate_contributors_list.sh

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+#!/bin/bash
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the SwiftNIO open source project
+##
+## Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
+## Licensed under Apache License v2.0
+##
+## See LICENSE.txt for license information
+## See CONTRIBUTORS.txt for the list of SwiftNIO project authors
+##
+## SPDX-License-Identifier: Apache-2.0
+##
+##===----------------------------------------------------------------------===##
+
+set -eu
+here="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+contributors=$( cd "$here"/.. && git shortlog -es | cut -f2 | sed 's/^/- /' )
+
+cat > "$here/../CONTRIBUTORS.txt" <<- EOF
+	For the purpose of tracking copyright, this is the list of individuals and
+	organizations who have contributed source code to Soto.
+
+	For employees of an organization/company where the copyright of work done
+	by employees of that company is held by the company itself, only the company
+	needs to be listed here.
+
+	## COPYRIGHT HOLDERS
+
+	### Contributors
+
+	$contributors
+
+	**Updating this list**
+
+	Please do not edit this file manually. It is generated using \`./scripts/generate_contributors_list.sh\`. If a name is misspelled or appearing multiple times: add an entry in \`./.mailmap\`
+EOF