Add an issue template
I used markdown for this because I think issues only support GitHub flavored
markdown.
diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
new file mode 100644
index 0000000..1d88686
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE.md
@@ -0,0 +1,54 @@
+<!--
+ -- Thanks for filing a `petgraph` issue! Fill out the appropriate template
+ -- below. We appreciate it :)
+ -->
+
+<!-- ************************ BUG REPORTS *************************** -->
+
+### Test Case
+
+Insert your test case here, ideally in the form of Rust code that creates a
+graph.
+
+### Steps To Reproduce
+
+Insert instructions for reproducing the bug with the above test case:
+
+* First, ...
+* Then, ...
+* ...
+
+Bonus points if these STR are in the form of a `#[test]` that demonstrates the
+bug, and can be used as a regression test once the bug is fixed
+
+### Actual Results
+
+Insert a panic backtrace here, or wrong answer, or whatever.
+
+### Expected Results
+
+The correct result / behavior that you expect when following the STR with the
+test case. Maybe a `None` returned instead of a panic, or some node A instead of
+the node B that was returned.
+
+<!-- ************************ FEATURE REQUESTS ************************ -->
+
+### Summary
+
+A couple sentence summary of the requested feature.
+
+### Motivation
+
+What does adding this feature enable that isn't possible without it? Does it
+improve performance? Turn dynamic checks into statically enforced properties?
+Explain why this feature should be implemented.
+
+### Details
+
+* What code needs to change? New traits? Which modules?
+
+* Is this a new graph algorithm? Include links to papers, Wikipedia, or other
+ implementations of this algorithm that exist.
+
+* Are you willing to implement this yourself? Mentor someone else and help them
+ implement it?
