doc: add issue and pull request templates

Fixes #14365

Change-Id: I082329fe7a1e06c774a32e0e24e5c8736bb5a037
Reviewed-on: https://go-review.googlesource.com/19877
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/.github/ISSUE_TEMPLATE b/.github/ISSUE_TEMPLATE
new file mode 100644
index 0000000..f44c6b9
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE
@@ -0,0 +1,18 @@
+Please answer these questions before submitting your issue. Thanks!
+
+1. What version of Go are you using (`go version`)?
+
+
+2. What operating system and processor architecture are you using (`go env`)?
+
+
+3. What did you do?
+(Use play.golang.org to provide a runnable example, if possible.)
+
+
+4. What did you expect to see?
+
+
+5. What did you see instead?
+
+