Added OSSMETADATA, CONTRIBUTING, CHANGELOG and updated README.

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Contributing to dgs-codegen
+
+If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.
+
+When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible.
+
+## License
+
+By contributing your code, you agree to license your contribution under the terms of the APLv2: https://github.com/Netflix/osstracker/blob/master/LICENSE
+
+All files are released with the Apache 2.0 license.
+
+If you are adding a new file it should have a header like this:
+
+```
+/**
+ * Copyright 2020 Netflix, Inc.
+ * 
+ * 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.
+ */
+ ```

OSSMETADATA

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+osslifecycle=private

README.md

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-# Netflix GraphQL DGS Code Generation Plugin
+[![Apache 2.0](https://img.shields.io/github/license/nebula-plugins/gradle-netflixoss-project-plugin.svg)](http://www.apache.org/licenses/LICENSE-2.0)
+
+# DGS Code Generation Plugin
 
 The DGS Code Generation plugin generates code for basic types and example data fetchers based on the your Domain Graph Service's graphql schema file during the project's build process.
 The plugin requires the path to schema files and the package name to use to generate the file. If no schema path is specified,