Adding a formal way to contribute to the project

Author: alexandref75

CONTRIBUTING.md

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+# Contributing to SMARTER
+
+SMARTER is an open-source, software platform for the Edge. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+# Project license, and developer certificate of origin
+
+The SMARTER codebase is licensed under the Apache 2.0 open source license, individual components may have their own licenses. 
+Please see the LICENSE file in the SMARTER documentation repository for the full text of this license, or the LICENSE file
+in respective repositories.  New contributions are expected to be lisensed under the Apache 2.0 license or something compatible
+with that license.
+
+Please note that we expect contributors to the project to self-certify that they are authorized to contribute code 
+using the Linux Foundation's Developer Certificate of Origin. See http://developercertificate.org for more details.
+
+Contributors sign-off that they adhere to these requirements by adding a Signed-off-by line to commit messages.
+Pull requests for contributions without a signed-off-by line will not be accepted.