Create CONTRIBUTING.md

Author: tishion

CONTRIBUTING.md

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+This project welcomes contributions and suggestions. 
+Make sure to align your code style with the configuration defined by .clang-format file
+
+Making contributions is not a hard thing. 
+- Solving an issue(maybe just answering a question raised in issues list or gitter)-
+- Fixing/Issuing a bug
+- Improving the documents and even fixing a typo 
+are important contributions to QCefView
+
+If you would like to become one of QCefView's maintainers to contribute more (e.g. help merge PR, triage issues), please contact me by email(sheentianshen#gmail.com). I am glad to help you to set the right permission.