Add missing legal boilerplate files; rename LICENSE to LICENSE.txt (#17)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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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.
+#
+-->
+[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)
+
+# Contributing to Apache OpenWhisk
+
+Anyone can contribute to the OpenWhisk project and we welcome your contributions.
+
+There are multiple ways to contribute: report bugs, improve the docs, and
+contribute code, but you must follow these prerequisites and guidelines:
+
+ - [Contributor License Agreement](#contributor-license-agreement)
+ - [Raising issues](#raising-issues)
+ - [Coding Standards](#coding-standards)
+
+### Contributor License Agreement
+
+All contributors must sign and submit an Apache CLA (Contributor License Agreement).
+
+Instructions on how to do this can be found here:
+[http://www.apache.org/licenses/#clas](http://www.apache.org/licenses/#clas)
+
+Once submitted, you will receive a confirmation email from the Apache Software Foundation (ASF) and be added to
+the following list: http://people.apache.org/unlistedclas.html.
+
+Project committers will use this list to verify pull requests (PRs) come from contributors that have signed a CLA.
+
+We look forward to your contributions!
+
+## Raising issues
+
+Please raise any bug reports or enhancement requests on the respective project repository's GitHub issue tracker. Be sure to search the
+list to see if your issue has already been raised.
+
+A good bug report is one that make it easy for us to understand what you were trying to do and what went wrong.
+Provide as much context as possible so we can try to recreate the issue.
+
+A good enhancement request comes with an explanation of what you are trying to do and how that enhancement would help you.
+
+### Discussion
+
+Please use the project's developer email list to engage our community:
+[dev@openwhisk.incubator.apache.org](dev@openwhisk.incubator.apache.org)
+
+In addition, we provide a "dev" Slack team channel for conversations at:
+https://openwhisk-team.slack.com/messages/dev/
+
+### Coding standards
+
+Please ensure you follow the coding standards used throughout the existing
+code base. Some basic rules include:
+
+ - all files must have the Apache license in the header.
+ - all PRs must have passing builds for all operating systems.
+ - the code is correctly formatted as defined in the [Scalariform plugin properties](tools/eclipse/scala.properties). If you use IntelliJ for development this [page](https://plugins.jetbrains.com/plugin/7480-scalariform) describes the setup and configuration of the plugin.
diff --git a/DISCLAIMER.txt b/DISCLAIMER.txt
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+Apache OpenWhisk Runtime Ruby is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
diff --git a/LICENSE b/LICENSE.txt
similarity index 100%
rename from LICENSE
rename to LICENSE.txt
diff --git a/NOTICE.txt b/NOTICE.txt
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+Apache OpenWhisk Runtime Ruby
+Copyright 2016-2019 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).