Add CONTRIBUTING.md

Author: tardieu

CONTRIBUTING.md

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+<!--
+# Copyright IBM Corporation 2020,2021
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+-->
+
+# Contributing
+
+This page contains information about reporting issues.
+
+## Table of Contents
+
+* [Reporting an Issue](#reporting-an-issue)
+
+## Reporting an Issue
+
+To report an issue, or to suggest an idea for a change, open an
+[issue](../../issues/new). It is best to check
+our existing [issues](../../issues) first
+to see if a similar one has already been opened and discussed.