Add issue and PR templates

.github/ISSUE_TEMPLATE.md

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+<!--
+Hi there! thank you for discovering and submitting an issue!
+
+Please first tell us a little bit about the environment you're running:
+The commands in the comments can be run directly in a command prompt.
+--> 
+
+# Context
+- **OS and version used:** <VERSION> <!-- Windows 10, Ubuntu 15.04... -->
+- **Node.js version:** <VERSION> <!-- in a command prompt: node --version -->
+- **npm version:** <VERSION> <!-- in a command prompt: npm --version -->
+- **list of installed packages:** <VERSION> <!-- in a command prompt, from the directory containing your code: npm list --> 
+
+# Description of the issue:
+<!-- please be as detailed as possible: which feature has a problem, how often does it fail,  -->
+
+# Code sample exhibiting the issue: 
+<!-- Please remove any connection string information! --> 
+
+# Console log of the issue:  
+<!-- Consider setting the DEBUG environment variable to '*'. This will produce a much more verbose output that will help debugging -->
+<!-- Don't forget to remove any connection string information! -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for helping us improve the Azure IoT Node.js SDK!
+
+Here's a little checklist of things that will help it make its way to the repository: Note that you don't have to check all the boxes, we can help you with that. 
+This being said, the more you do, the quicker it'll go through our gated build! 
+--> 
+
+# Checklist
+- [ ] I have read the [contribution guidelines] (https://github.com/Azure/azure-iot-sdk-node/blob/master/.github/CONTRIBUTING.md).
+- [ ] I added or modified the existing tests to cover the change (we do not allow our test coverage to go down).
+- If this is a modification that impacts the behavior of a public API
+  - [ ] I edited the corresponding document in the `devdoc` folder and added or modified requirements.
+- I submitted this PR against the correct branch: 
+  - [ ] This pull-request contains code (and maybe docs): it is submitted against the `develop` branch. 
+  - [ ] This pull-request contains only docs: it is submitted against the `master` branch. 
+
+# Reference/Link to the issue solved with this PR (if any)
+
+# Description of the problem
+<!-- Please be as precise as possible: what issue you experienced, how often... -->
+
+# Description of the solution
+<!-- How you solved the issue and the other things you considered and maybe rejected -->