[Root Doc] Add CONTRIBUTING

Github wants CONTRIBUTING file:
https://help.github.com/articles/setting-guidelines-for-repository-contributors/

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

diff --git a/CONTRIBUTING b/CONTRIBUTING
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+# Contributing
+
+See [Contributing](Documentation/contributing.md) for information about coding styles, making pull requests, and more.
+
+# Developers
+
+- See [Getting Started](Documentation/getting-started.md) for information about building this software.
+- See [How to Run Examples](Documentation/how-to-run-examples.md) for information about building and running examples applications.
+- See [How to Use Testcases](Documentation/how-to-use-testcases.md) for information about running test cases and writing ones.