github issue and PR templates

.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
+
+**Target**
+K64F|??
+
+**Toolchain:**
+GCC_ARM|ARM|IAR
+
+**Toolchain version:**
+
+**mbed-cli version:** 
+(`mbed --version`)
+
+**meed-os sha:**
+(`git log -n1 --oneline`)
+
+**DAPLink version:**
+
+**Expected behavior**
+
+**Actual behavior**
+
+**Steps to reproduce**
+
+----------------------------------------------------------------
+## Enhancement
+
+**Reason to enhance or problem with existing solution**
+
+**Suggested enhancement**
+
+**Pros**
+
+**Cons**
+
+-----------------------------------------------------------------
+
+## Question
+
+**How to?**

.github/pull_request_template.md

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+Notes:
+* Pull requests will not be accepted until the submitter has agreed to the [contributer agreement](https://github.com/ARMmbed/mbed-os/blob/master/CONTRIBUTING.md).
+* This is just a template, so feel free to use/remove the unnecessary things
+
+## Description
+A few sentences describing the overall goals of the pull request's commits.
+
+
+## Status
+**READY/IN DEVELOPMENT/HOLD**
+
+
+## Migrations
+If this PR changes any APIs or behaviors, give a short description of what *API users* should do when this PR is merged.
+
+YES | NO
+
+
+## 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 the deployment of this PR. These should note any
+required changes in the build environment, tools, compilers, etc.
+
+
+## Steps to test or reproduce
+Outline the steps to test or reproduce the PR here.