Add issues template for github (#287)

* Added issue template file to help users.

* Added link to markdown docs

* reformat

.github/issue_template.md

@@ -0,0 +1,31 @@
+<!--- Provide a general summary of the issue in the Title above -->
+<!--- https://guides.github.com/features/mastering-markdown/#examples -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant, or attach screenshots -->
+1. 
+2. 
+3. 
+4. 
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Netdisco version used: 
+* SNMP::Info version used: