Create issue_template.md

.github/ISSUE_TEMPLATE/issue_template.md

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+Description 
+=========== 
+_provide a complete description of the work to be done_
+
+Modules to be created 
+--------------------- 
+_a list of modules that should be created_
+
+Modules to be modified
+---------------------- 
+_a list of modules that are expected to be modified_
+
+Tests to be created/updated 
+--------------------------- 
+_a list of tests to be created/updated (unit-tests and hardware test scripts)_
+
+Documentation to be updated 
+--------------------------- 
+_a list of documents that need updates (like CHANGELOG.md, Sphinx docs)_
+
+Hardware 
+-------- 
+_a list of hardware if needed for testing; must be available!_
+