Add Github issue template

See https://blog.github.com/2016-02-17-issue-and-pull-request-templates/

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,25 @@
+**Summary:** 
+
+Summarize your issue in one sentence (what goes wrong, what did you expect to happen)
+
+**Steps to reproduce:** 
+
+How can we reproduce the issue?
+
+**Expected behavior:** 
+
+What did you expect the app to do?
+
+**Observed behavior:** 
+
+What did you see instead?  Describe your issue in detail here.
+
+**Device, Android, and Embedded Social SDK version:** 
+
+What version of the Embedded Social SDK did you use?
+
+What make and model device (e.g., Samsung Galaxy S8) did you encounter this on?  What Android version (e.g., Android 8.0 Oreo) are you running?  Is it the stock version from the manufacturer or a custom ROM?  What version of Google Play Services is running on your device?
+
+**Screenshots:** 
+
+Can be created by pressing the Volume Down and Power Button at the same time on Android 4.0 and higher.