Add issue and PR github templates

Author: bridadan

.github/issue_template.md

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+<!--
+
+   ************************************** WARNING **************************************
+
+   The ciarcom bot parses this header automatically. Any deviation from the
+   template may cause the bot to automatically correct this header or may result in a
+   warning message, requesting updates.
+
+   Please ensure that nothing follows the "Issue request type" section, all
+   issue details are within the Description section and no changes are made to the
+   template format (as detailed below).
+
+   *************************************************************************************
+
+-->
+
+### Description
+
+<!--
+    **Required**
+    Add detailed description of what you are reporting.
+    Good example: https://os.mbed.com/docs/mbed-os/v5.11/contributing/workflow.html
+    Things to consider sharing:
+    - What target does this relate to?
+    - What toolchain (name + version) are you using?
+    - What tools (name + version - is it mbedgt, mbed-ls, etc) are you using?
+    - What version of mbed-os-tools are you using (pip show mbed-os-tools)?
+    - Steps to reproduce. (Did you publish code or a test case that exhibits the problem?)
+-->
+
+
+### Issue request type
+
+<!--
+    **Required**
+    Please add only one X to one of the following types. Do not fill multiple types (split the issue otherwise.)
+    Please note this is not a GitHub task list, indenting the boxes or changing the format to add a '.' or '*' in front
+    of them would change the meaning incorrectly. The only changes to be made are to add a description text under the
+    description heading and to add a 'x' to the correct box.
+-->
+    [ ] Question
+    [ ] Enhancement
+    [ ] Bug

.github/pull_request_template.md

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+### Description
+
+<!--
+    **Required**
+    Add here detailed changes summary, testing results, dependencies
+    Good example: https://os.mbed.com/docs/mbed-os/v5.11/contributing/workflow.html (Pull request template)
+-->
+
+
+### Pull request type
+
+<!--
+    **Required**
+    Please add only one X to one of the following types. Do not fill multiple types (split the pull request otherwise).
+    Please note this is not a GitHub task list, indenting the boxes or changing the format to add a '.' or '*' in front
+    of them would change the meaning incorrectly. The only changes to be made are to add a description text under the
+    description heading and to add a 'x' to the correct box.
+-->
+    [ ] Fix
+    [ ] Refactor
+    [ ] Target update
+    [ ] Functionality change
+    [ ] Docs update
+    [ ] Test update
+    [ ] Breaking change
+
+### Reviewers
+
+<!--
+    Optional
+    Request additional reviewers with @username
+-->