add .github/ISSUE_TEMPLATE.md

Author: thepriefy

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,17 @@
+#### Issue Summary
+
+A summary of the issue and the environment in which it occurs. If suitable, include the steps required to reproduce the bug. Please feel free to include screenshots, screencasts, code examples.
+
+
+#### Steps to Reproduce
+
+1. This is the first step
+2. This is the second step
+3. Further steps, etc.
+
+Any other information you want to share that is relevant to the issue being reported. Especially, why do you consider this to be a bug? What do you expect to happen instead?
+
+#### Technical details:
+
+* smtpapi-nodejs Version: master (latest commit: [commit number])
+* Node.js Version: 4.x.x