ACCUMULO-4736 Created CONTRIBUTING.md (#2)
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+<!--
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements. See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 to the Accumulo Docker Image
+
+Contributions to the Accumulo Docker Image can be made by creating a pull request to
+this repo on GitHub.
+
+Before creating a pull request, follow the instructions in the [README.md] to build
+the image and use it to run Accumulo in Docker.
+
+For general instructions on contributing to Accumulo projects, check out the
+[Accumulo Contributor guide][contribute].
+
+[README.md]: README.md
+[contribute]: https://accumulo.apache.org/contributor/
