github: adding issue and pr templates

Author: vlastahajek

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!--
+
+Thank you for reporting a bug. 
+
+* Please add a :+1: or comment on a similar existing bug report instead of opening a new one.
+    * https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+is%3Aclosed+sort%3Aupdated-desc+label%3Abug+
+* Please check whether the bug can be reproduced with the latest release.
+* The fastest way to fix a bug is to open a Pull Request.
+    * https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pulls
+
+-->
+
+__Steps to reproduce:__
+List the minimal actions needed to reproduce the behavior.
+
+1. ...
+2. ...
+3. ...
+
+__Expected behavior:__
+Describe what you expected to happen.
+
+__Actual behavior:__
+Describe What actually happened.
+
+__Specifications:__
+ - Library Version:
+ - InfluxDB Version:
+ - Board/ESP chip:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Opening a feature request kicks off a discussion
+---
+
+<!--
+
+Thank you for suggesting an idea to improve this client. 
+
+* Please add a :+1: or comment on a similar existing feature request instead of opening a new one.
+    * https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/issues?q=is%3Aissue+sort%3Aupdated-desc+label%3A%22feature+request%22+is%3Aopen
+
+-->
+
+__Proposal:__
+Short summary of the feature.
+
+__Current behavior:__
+Describe what currently happens.
+
+__Desired behavior:__
+Describe what you want.
+
+__Alternatives considered:__
+Describe other solutions or features you considered.
+
+__Use case:__
+Why is this important (helps with prioritizing requests)?

.github/pull_request_template.md

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+Closes #
+
+## Proposed Changes
+
+_Briefly describe your proposed changes:_
+
+## Checklist
+
+<!-- Checkboxes below this note can be erased if not applicable to your Pull Request. -->
+
+- [ ] CHANGELOG.md updated
+- [ ] Rebased/mergeable
+- [ ] A test has been added if appropriate
+- [ ] Tests pass
+- [ ] Commit messages are in [semantic format](https://seesparkbox.com/foundry/semantic_commit_messages)