Create ISSUE_TEMPLATE.md (#235)

ISSUE_TEMPLATE.md

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+**Do you want to request a *feature* or report a *bug*?**
+
+
+**What is the current behavior?**
+
+
+**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.**
+
+
+**What is the expected behavior?**
+
+
+**Which versions todo.sh are you using?**
+> Run `todo.sh -V`
+
+
+**Which Operating System are you using?**
+
+
+**Which version of bash are you using?**
+> Run `bash --version`
+