Add github issue template
Required for internal issue tracking.
diff --git a/.github/issue_template.md b/.github/issue_template.md
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+++ b/.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/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 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
+