Add contributor guides to accompany blog post #1840

Someone the old merge was overridden

CONTRIBUTING.md

@@ -2,6 +2,8 @@
 
 Cytoscape.js is an open source project, and we greatly appreciate any and all contributions.
 
+A blog post is available [on blog.js.cytoscape.org](http://blog.js.cytoscape.org/2017/05/09/contributing/) geared towards first-time contributors with more in-depth instructions on the project's structure, the process of creating and merging changes to the code, and more.
+
 If you'd like to contribute code to Cytoscape.js but you're not sure exactly what you'd like to implement, take a look at our [current milestones](https://github.com/cytoscape/cytoscape.js/milestones) to see what features we have planned in future --- or anything labelled [`help-wanted`](https://github.com/cytoscape/cytoscape.js/issues?q=is%3Aopen+is%3Aissue+label%3Ahelp-wanted).  Of course, we also welcome your own ideas.
 
 Our goal is to make Cytoscape.js as comprehensive as possible.  Thank you for taking the time and effort to contribute to help make that happen!

ISSUE_TEMPLATE.md

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+## **I'm submitting a:**
+- [ ] Bug report
+- [ ] Feature request
+- [ ] *Requests for help should be directed to [Stack Overflow](http://stackoverflow.com/questions/tagged/cytoscape.js) or [Gitter](https://gitter.im/cytoscape/cytoscape.js)*
+
+--------------------
+
+## Bug reports
+
+When submitting a bug report, check the following:
+- [ ] Report has a descriptive title
+- [ ] Bug still exists in most recent Cy.js version
+
+### Environment info
+- [ ] Browser and version:
+  - [ ] Node version (if running headless):
+- [ ] Cytoscape.js version:
+
+### Current behavior
+<!-- What does the bug do? -->
+
+### Desired behavior
+<!-- What do you expect Cytoscape.js to do instead? -->
+
+### Minimum steps to reproduce
+<!-- Repos that can be cloned to reproduce bug or a link to a JSBin/ CodePen/ JSFiddle are appreciated!  It helps to address your issue faster. -->
+
+--------------------
+
+## Feature requests
+
+### Description of new feature
+
+### Motivation for new feature
+<!-- Describe your use case for this new feature -->