Add CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing to Eclipse zenoh
+
+Thanks for your interest in this project.
+
+## Project description
+
+Eclipse zenoh provides is a stack  designed to 
+  1. minimize network overhead, 
+  2. support extremely constrained devices, 
+  3. supports devices with low duty-cycle by allowing the negotiation of data exchange modes and schedules, 
+  4. provide a rich set of abstraction for distributing, querying and storing data along the entire system, and 
+  5. provide extremely low latency and high throughput.
+
+* https://projects.eclipse.org/projects/iot.zenoh
+
+## Developer resources
+
+Information regarding source code management, builds, coding standards, and
+more.
+
+* https://projects.eclipse.org/projects/iot.zenoh/developer
+
+The project maintains the following source code repositories
+
+* https://github.com/eclipse-zenoh
+
+## Eclipse Contributor Agreement
+
+Before your contribution can be accepted by the project team contributors must
+electronically sign the Eclipse Contributor Agreement (ECA).
+
+* http://www.eclipse.org/legal/ECA.php
+
+Commits that are provided by non-committers must have a Signed-off-by field in
+the footer indicating that the author is aware of the terms by which the
+contribution has been provided to the project. The non-committer must
+additionally have an Eclipse Foundation account and must have a signed Eclipse
+Contributor Agreement (ECA) on file.
+
+For more information, please see the Eclipse Committer Handbook:
+https://www.eclipse.org/projects/handbook/#resources-commit
+
+## Contact
+
+Contact the project developers via the project's "dev" list.
+
+* https://accounts.eclipse.org/mailing-list/zenoh-dev
+
+Or via the Gitter channel.
+
+* https://gitter.im/eclipse/zenoh