github: add issues template

[ci skip]

.gitattributes

@@ -21,4 +21,5 @@ fish.spec.in export-ignore
 /build_tools/make_darcs_completions.fish export-ignore
 /debian export-ignore
 /debian/* export-ignore
-
+/.github export-ignore
+/.github/* export-ignore

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,40 @@
+<!--
+Thanks for helping to make fish better!
+
+If you are asking for help with fish, or you've found a bug:
+ - Make sure it's not a known or solved issue, by searching https://github.com/fish-shell/fish-shell/issues
+ - Fill in the following information carefully:
+
+-->
+
+[Please include a short description of the problem here]
+
+### Reproduction Steps:
+
+1. [First Step]
+2. [Second Step]
+3. [Other Steps...]
+
+### Expected behavior:
+
+[Describe expected behavior here]
+
+### Observed behavior:
+
+[Describe observed behavior here]
+
+### Additional information:
+
+[ Other useful information, such as:
+  When did this problem start?
+  Does this happen all the time?
+  Has anything changed on your system recently?
+]
+  
+
+---
+Fish version: [from the output of fish --version]
+
+Operating system: [your operating system and how you installed fish e.g. Homebrew, Ubuntu PPA, distribution package]
+
+Terminal or terminal emulator: [e.g. PuTTy, iTerm2, GNOME Terminal, VT220]