Add CONTRIBUTING.md

Signed-off-by: Shuoran Liu <[email protected]>

CONTRIBUTING.md

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+# Contributing to ChubaoFS
+
+## Bug Reports
+
+Please make sure the bug is not already reported by [searching the repository](https://github.com/chubaofs/chubaofs/search?q=&type=Issues&utf8=%E2%9C%93) with reasonable keywords. Then, [open an issue](https://github.com/chubaofs/chubaofs/issues) with steps to reproduce.
+
+## Patch Guidelines
+
+In order for the patch to be accepted with higher possibility, there are a few things you might want to pay attention to:
+
+* [Filesystem stress tests](https://github.com/linux-test-project/ltp/blob/master/runtest/fs) is required before opening a pull request by `runltp -f fs -d [MOUNTPOINT]`.
+* A good commit message describing the bug fix or the new feature is preferred.
+* [DCO](https://github.com/apps/dco) is required, so please add `Signed-off-by` to the commit.
+
+## Credits
+
+Sections of this documents have been borrowed from [CoreDNS](https://github.com/coredns/coredns/blob/master/CONTRIBUTING.md) and [Fluentd](https://github.com/fluent/fluentd/blob/master/CONTRIBUTING.md)