Add spike issue template

.github/ISSUE_TEMPLATE/spike.md

@@ -0,0 +1,19 @@
+---
+name: Spike
+about: Create a spike.
+title: ''
+labels: Spike
+assignees: ''
+
+---
+
+# Spike
+
+## Objective
+_A description of this spike's objective._
+
+## Scope
+_Add an explanation of how this spike is bounded (e.g. time-boxed or a checklist of tasks or questions that must be answered)._
+
+## Output
+_Add a description or list of expected outputs that result from successful completion of this spike. Some examples of outputs are more GitHb issues (e.g. bugs), a trade study, or a report detailing what was learned during the spike._