Create ISSUE_TEMPLATE.md

[danielduan]

Too many issues don't have steps to reproduce bugs, adding template here to guide issue creators.

[codecov]

Codecov Report

Merging #2426 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2426   +/-   ##
=======================================
  Coverage   16.64%   16.64%           
=======================================
  Files         302      302           
  Lines        7769     7769           
  Branches      772      785   +13     
=======================================
  Hits         1293     1293           
- Misses       5854     5857    +3     
+ Partials      622      619    -3

Impacted Files	Coverage Δ
addons/a11y/src/components/WrapStory.js	0% <0%> (ø)	⬆️
addons/jest/src/hoc/provideJestResult.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/search_box.js	32.55% <0%> (ø)	⬆️
lib/components/src/navigation/routed_link.js	23.63% <0%> (ø)	⬆️
...mments/src/manager/components/CommentForm/index.js	0% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/text.js	33.33% <0%> (ø)	⬆️
addons/info/src/components/Props.js	37.2% <0%> (ø)	⬆️
addons/knobs/src/components/types/Array.js	29.72% <0%> (ø)	⬆️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
... and 41 more

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[Hypnosphi]

Let's use actual package names to avoid confusion