Add a draft contributing.md (#489)

* Add contributing.md

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+Here is some information that's good to know when contributing to JavaParser:
+
+- if you're new and like to contribute something, check out the [easy issues](https://github.com/javaparser/javaparser/labels/Easy).
+- we work on JavaParser because we like to, not because it earns us money. Please remember that we try to run a professional project in our spare time, on a budget of zero.
+- if you know how to fix a problem, please fix it and open a pull request instead of opening an issue.
+- if you start working on an issue, please say so with a comment in the issue.
+- a pull request should include tests. You can either use BDD ([more information here](https://github.com/javaparser/javaparser/wiki/Testing)) or JUnit.
+- every pull request will automatically be checked by a few tools. Make sure AppVeyor and Travis are green.
+- there is some interesting information on the [wiki](https://github.com/javaparser/javaparser/wiki).
+- be sure to check [the coding guidelines](https://github.com/javaparser/javaparser/wiki/Coding-Guidelines) which are easily used by installing the formatting rules as described there.
+- pull requests often stay open for at least a few days to give people a chance to review it.
+- a pull request is merged when all comments on it have been resolved.
+- if you create a pull request for an issue, mention the issue in the format #123 to make github link it automatically.
+
+Thanks for helping!