Add a templates from mbed-os

Add the mbed-os issue and pull request template.

Author: c1728p9

.github/issue_template.md

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+### Description
+<!-- 
+    Required
+    Add detailed description of what you are reporting.
+    Good example: https://os.mbed.com/docs/latest/reference/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 mbed-cli, online compiler or IDE) are you using?
+    - What is the SHA of Mbed OS (git log -n1 --oneline)?
+    - 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 changes the meaning incorrectly. The only changes to make are to add a description under the
+    description heading and to add an 'x' to the correct box.
+
+    [X] Question
+    [ ] Enhancement 
+    [ ] Bug 
+-->
+
+[ ] 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/latest/reference/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
+    [ ] Breaking change
+