Added guide to raising an issue

ISSUES.md

@@ -0,0 +1,20 @@
+How to raise an issue
+=====================
+
+If you have an SDF account
+--------------------------
+
+You can only raise an issue with SDF git if:
+
+1. You have MetaARPA membership
+2. You have an SDF git account (you can email membership to get one)
+
+If you have both, use the built in issue tracker.
+
+If you don't have an SDF account
+--------------------------------
+
+Email me at <ilikecats@sdf.org>, and tell me that there's an issue, and what
+the issue is. I will verify it, and if there is an issue, I will raise an
+issue on the issue tracker. I will also email you back with a link to the
+issue, and you can reply the the email with any comments you wish to add.