add issue template

Author: GeneAndGoogle

.github/ISSUE_TEMPLATE/advanced-android-in-kotlin-issue.md

@@ -0,0 +1,26 @@
+---
+name: Advanced Android in Kotlin issue
+about: Report problems with Advanced Android in Kotlin codelab.
+title: " Advanced Android in Kotlin: Notifications 1.1 [Step #][description]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the problem**
+A clear and concise description of what the problem is.
+
+**In which lesson and step of the codelab can this issue be found?**
+Lesson number + step number. (e.g., Lesson 1.1, Step 1.3)
+
+**How to reproduce?**
+What are the exact steps to reproduce the problem?
+
+**Versions**
+1. What version of Android Studio are you using?
+2. What API level are you targeting?
+
+**Additional information**
+Add any other context about the problem here.
+
+**codelab:** advanced-android-kotlin