added Contributing.md

.github/CONTRIBUTING.md

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+# Contributing
+I would love to see people getting involved.<br>
+If you have a feature request please create an issue. Also if you're even improving inline-style-prefixer by any kind please don't be shy and send a pull request to let everyone benefit.
+
+### Issues
+If you're having any issue please let me know as fast as possible to find a solution a hopefully fix the issue. Try to add as much information as possible such as your environment, exact case, the line of actions to reproduce the issue.
+
+### Pull Requests
+If you are creating a pull request, try to use commit messages that are self-explanatory. Also always add some **tests** unless it's totally senseless (add a reason why it's senseless) and test your code before you commit so Travis won't throw errors.