Add issue and pull request template

Signed-off-by: 1998-felix <felix.gateru@gmail.com>

.github/ISSUE_TEMPLATE.md

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+<!--
+The GitHub issue tracker is for bug reports and feature requests. General support can be found at
+the following locations:
+
+- Google group - https://groups.google.com/forum/#!forum/mainflux
+- Gitter - https://gitter.im/mainflux/mainflux
+-->
+
+**FEATURE REQUEST**
+
+1. Is there an open issue addressing this request? If it does, please add a "+1" reaction to the
+   existing issue, otherwise proceed to step 2.
+
+2. Describe the feature you are requesting, as well as the possible use case(s) for it.
+
+3. Indicate the importance of this feature to you (must-have, should-have, nice-to-have).
+
+**BUG REPORT**
+
+1. What were you trying to achieve?
+
+2. What are the expected results?
+
+3. What are the received results?
+
+4. What are the steps to reproduce the issue?
+
+5. In what environment did you encounter the issue?
+
+6. Additional information you deem important:
+
+**ENHANCEMENT**
+1. Describe the enhancement you are requesting. Enhancements include:
+   - tests
+   - code refactor
+   - documentation
+   - research
+   - tooling
+
+2. Indicate the importance of this enhancement to you (must-have, should-have, nice-to-have).

.github/PULL_REQUEST_TEMPLATE.md

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+Pull request title should be `MBD-XXX - description` or `NOISSUE - description` where XXX is ID of issue that this PR relate to.
+Please review the [CONTRIBUTING.md](https://github.com/mainflux/mainflux/blob/master/CONTRIBUTING.md) file for detailed contributing guidelines.
+
+### What does this do?
+
+### Which issue(s) does this PR fix/relate to?
+Put here `Resolves #XXX` to auto-close the issue that your PR fixes (if such)
+
+### List any changes that modify/break current functionality
+
+### Have you included tests for your changes?
+
+### Did you document any new/modified functionality?
+
+### Notes