Add basic issue template to collect necessary version info

Author: jhand2

.github/ISSUE_TEMPLATE/generic-caliptra-issue.md

@@ -0,0 +1,13 @@
+---
+name: Generic Caliptra Issue
+about: Generic Caliptra Issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Please include the following information
+
+* Caliptra Version(s) (e.g. 1.1, 2.1)
+* Caliptra Mode (Subsystem Mode, Core Mode, Both)