Add issue and PR templates

Author: Pierre Cauchois

CONTRIBUTING.md .github/CONTRIBUTING.md

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+<!--
+Hi there! Thank you for discovering and submitting an issue.
+
+Before your submit it though, please consider that each Azure IoT SDK now lives in its own repository. You can follow this link to create a new issue for a specific SDK:
+- C:      https://github.com/azure/azure-iot-sdk-c/issues/new
+- .NET:   https://github.com/azure/azure-iot-sdk-csharp/issues/new
+- Node:   https://github.com/azure/azure-iot-sdk-node/issues/new
+- Java:   https://github.com/azure/azure-iot-sdk-java/issues/new
+- Python: https://github.com/azure/azure-iot-sdk-python/issues/new
+
+It's going to be a lot easier for us to track and link your issue to its resolution (commit hash, etc) in the concerned SDK repository directly.
+
+If you think the issue you discovered belongs here more than in any specific SDK repository, please consider the following list of questions that will help us debug the issue:
+--> 
+
+- SDK used to discover the issue: 
+- Date/Time at which the issue was discovered: 
+- Name of the hub on which the issue happened (if it can be disclosed in public):
+- Device ID of the device that exhibited the issue:
+
+Code sample exhibiting the issue: <!-- Please do not leave any connection string details in here -->
+
+
+Console log of the issue: <!-- Please do not leave any connection string details in here either -->
+

.github/ISSUE_TEMPLATE.md

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+<!--
+Hi there! Thank you for your interest in the Azure IoT SDKs
+
+Before you create a pull request though, please consider that each Azure IoT SDK now lives in its own repository:
+- C:      https://github.com/azure/azure-iot-sdk-c
+- .NET:   https://github.com/azure/azure-iot-sdk-csharp
+- Node:   https://github.com/azure/azure-iot-sdk-node
+- Java:   https://github.com/azure/azure-iot-sdk-java
+- Python: https://github.com/azure/azure-iot-sdk-python
+
+We will not be accepting pull-requests for SDK code in this repository, and encourage you to clone the specific SDK repository and submit your PR there. 
+Please remember that all code pull-requests must include tests and be submitted against the `develop` branch
+
+Thank you again, we appreciate all feedback!
+-->