added contributing info (#1006)

.github/ISSUE_TEMPLATE.md

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+# Hey, thank you for testing and contributing to wavesurfer.js!
+
+## Please make sure you can check all of these points below before opening an issue:
+
+(You don't have to post this section)
+
+- [ ] I have checked [the FAQ](https://wavesurfer-js.org/faq/) and it doesn't solve my problem.
+- [ ] I have checked [the documentation](https://wavesurfer-js.org/docs/) and it doesn't solve my problem
+- [ ] I have searched for [already open issues](https://github.com/katspaugh/wavesurfer.js/issues) which desribe my problem.
+- [ ] The issue I'm having is related to and caused by wavesurfer.js, not by other software (which maybe packages and uses wavesurfer incorrectly) – In that case you should open the issue on the respective project pages.
+
+## Please make sure you provide the following information (if applicable):
+
+### Wavesurfer.js version(s):
+
+
+### Browser version(s):
+
+
+### Code needed to reproduce the issue:
+
+(Please reduce your code as much as possible and only post the minimum code needed to reproduce the issue. [A Code pen](http://codepen.io/) is an excellent way to share such code)
+
+
+### Use behaviour needed to reproduce the issue:
+

.github/PULL_REQUEST_TEMPLATE.md

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+# Hey, thank you for contributing to wavesurfer.js!
+
+To review/merge open PRs it is very helpful to know as much as possible about the changes which are being introduced. Reviewing PRs is very time consuming, please be patient, it can take some time to do properly.
+
+**Title:** Please make sure the name of your PR is as descriptive as possible (Describe the feature that is introduced or the bug that is being fixed).
+
+## Please make sure you provide the information below:
+
+### Short description of changes:
+
+
+### Breaking in the external API:
+
+
+### Breaking changes in the internal API:
+
+
+### Todos/Notes:
+
+
+### Related Issues and other PRs: