REPO-2756 Add readme and contributing guide

CONTRIBUTING.md

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+### Contributing
+Thanks for your interest in contributing to this project!
+
+The following is a set of guidelines for contributing to this library. Most of them will make the life of the reviewer easier and therefore decrease the time required for the patch be included in the next version.
+
+Because this project forms a part of Alfresco Content Services, the guidelines are hosted in the [Alfresco Social Community](http://community.alfresco.com/community/ecm) where they can be referenced from multiple projects.
+
+Read an [overview on how this project is goverened](https://community.alfresco.com/docs/DOC-6385-project-overview-repository).
+
+You can report an issue in the ALF project of the [Alfresco issue tracker](http://issues.alfresco.com).
+
+Read [instructions for a good issue report](https://community.alfresco.com/docs/DOC-6263-reporting-an-issue).
+
+Read [instructions for making a contribution](https://community.alfresco.com/docs/DOC-6269-submitting-contributions).
+
+Please follow [the coding standards](https://community.alfresco.com/docs/DOC-4658-coding-standards).

README.md

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+### Alfresco Server Root
+The ROOT.war application is required to enable Alfresco Office Services (AOS).
+The source code contains packaging configuration required to build the _ROOT.war_ file.
+
+### Building
+The project can be built by running Maven command:
+~~~
+mvn clean install
+~~~
+
+### Artifacts
+The artifacts can be obtained by:
+* downloading from [Alfresco repository](https://artifacts.alfresco.com/nexus/content/groups/public)
+* getting as Maven dependency by adding the dependency to your pom file:
+~~~
+<dependency>
+  <groupId>org.alfresco</groupId>
+  <artifactId>alfresco-server-root</artifactId>
+  <version>version</version>
+</dependency>
+~~~
+and Alfresco Maven repository:
+~~~
+<repository>
+  <id>alfresco-maven-repo</id>
+  <url>https://artifacts.alfresco.com/nexus/content/groups/public</url>
+</repository>
+~~~
+The SNAPSHOT version of the artifact is **never** published.
+
+### Contributing guide
+Please use [this guide](CONTRIBUTING.md) to make a contribution to the project.