Adding issue template

Author: raghuhit

.github/issue_template.md

@@ -0,0 +1,19 @@
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Actual Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Steps to Reproduce the Problem
+
+  1.
+  2.
+  3.
+
+## browserstack.json
+<!-- Provide your browserstack.json, remember to exclude your browserstack username and access key.-->
+
+## Details
+<!--- Provide a detailed description of the issue that you are facing. -->