add issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,25 @@
+<!--
+
+If it is a bug report:
+- make sure you are able to repro it on the latest released version. 
+You can install the latest version by: `acme.sh --upgrade`
+
+- Search the existing issues.
+- Refer to the [WIKI](https://wiki.acme.sh).
+- Debug info [Debug](https://github.com/Neilpang/acme.sh/wiki/How-to-debug-acme.sh).
+
+
+-->
+
+Steps to reproduce
+------------------
+
+
+Debug log
+-----------------
+
+```
+acme.sh  --issue .....   --debug 2
+```
+
+