Added issue template

Author: zezha-msft

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+### Which version of the AzCopy was used? 
+##### Note: The version is visible when running AzCopy without any argument
+
+### Which platform are you using? (ex: Windows, Mac, Linux)
+
+### What command did you run?
+##### Note: Please remove the SAS to avoid exposing your credentials. If you cannot remember the exact command, please retrieve it from the beginning of the log file.
+
+### What problem was encountered?
+
+### How can we reproduce the problem in the simplest way?
+
+### Have you found a mitigation/solution?