initial issue and PR github templates

Author: Jussi Vatjus-Anttila

.github/issue_template.md

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+Note: This is just a template, so feel free to use/remove the unnecessary things
+
+### Description
+- Type: Bug | Enhancement | Question
+- Related Issue: `#abc`
+- Priority: Blocker | Major | Minor
+
+---------------------------------------------------------------
+## Bug
+
+**mbed-os sha**
+(`git describe --tags`)
+
+**mbed-cli version**
+(`mbed`)
+
+**Expected Behavior**
+
+**Actual Behavior**
+
+**Steps to Reproduce**
+
+----------------------------------------------------------------
+## Enhancement
+
+**Reason to enhance/problem with existing solution**
+
+**Suggested enhancement**
+
+**Pros**
+
+**Cons**
+
+-----------------------------------------------------------------
+
+## Question
+
+**How to?**

.github/pull_request_template.md

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+## Status
+**READY/IN DEVELOPMENT/HOLD**
+
+## Migrations
+YES | NO
+
+## Description
+A few sentences describing the overall goals of the pull request's commits.
+
+## Related PRs
+List related PRs against other branches:
+
+branch | PR
+------ | ------
+other_pr_production | [link]()
+other_pr_master | [link]()
+
+
+## Todos
+- [ ] Tests
+- [ ] Documentation
+
+
+## Deploy Notes
+Notes regarding deployment the contained body of work.  These should note any
+db migrations, etc.
+
+## Steps to Test or Reproduce
+Outline the steps to test or reproduce the PR here.