The current content in CONTRIBUTING.md is largely based on the "Patch Submission Process" Wiki page.
This commit also moves the DCO from the Wiki into the source tree.
In addition, clarify in README.md that contributions need to be licensed under the Apache License 2.0 and signed with the DCO.
JerryScript-DCO-1.0-Signed-off-by: Tilmann Scheller t.scheller@samsung.com
