Create CONTRIBUTING.md

CONTRIBUTING.md

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+#Contributing
+
+Your pull requests will be welcome; however, they may not be accepted for various reasons.
+
+##Guidelines for pull requests:
+
+1. Respect Notepad++ coding style.
+2. Make a single change per commit.
+3. Make your modification compact - don't reformat source code in your request. It makes code review more difficult.
+
+In short: The easier the code review is, the better the chance your pull request has to get accepted.
+
+