Add issue templates

Author: marcelstoer

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Do this '....'
+3. Do that '....'
+4. See error
+
+**Sample code**
+Provide a [MCVE](https://stackoverflow.com/help/minimal-reproducible-example) below.
+```c
+# your code goes here
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Versions (please complete the following information):**
+ - Library: [e.g. 4.2]
+ - Platform [e.g. ESP266 Arduino Core 2.5.x]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/support-request.md

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+---
+name: Support request
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+We offer support to our customers at https://support.thingpulse.com/. Send us an email if you don't have an account yet.