docs: Add documention for new contributors

Author: cassava

CONTRIBUTING.md

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+Contributing to Eclipse Cloe
+============================
+
+Thanks for your interest in this project.
+
+## Project Description
+
+Cloe is an enhanced middleware solution for closed-loop simulations, with a
+focus on functional software tests on system level. Cloe is used as a
+development tool for interactive and scripted workstation simulations, for code
+debugging, and for automated tests on servers. Cloe covers a central part of the
+verification and validation strategy, needed by all vendors in the field of
+Automated Driving.
+
+- https://projects.eclipse.org/projects/technology.cloe
+
+## Developer Resources
+
+Information regarding source code management, builds, coding standards, and
+more.
+
+- https://projects.eclipse.org/projects/technology.cloe/developer
+
+The project maintains the following source code repositories
+
+- https://github.com/eclipse/cloe
+
+## Eclipse Development Process
+
+This Eclipse Foundation open project is governed by the Eclipse Foundation
+Development Process and operates under the terms of the Eclipse IP Policy.
+
+## 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.
+
+- [email protected]