[ci skip]add issue template

Author: bobzhang

.github/CHECK_LIST.md

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+## Checklist
+
+  * [x] Does your title concisely summarize the problem?
+  * [x] Did you include a minimal, reproducable example? Is it an [SSCCE][sscce]?
+  * [x] What OS and browser are you using? What versions?
+  * [x] What version of OCaml are you using?
+
+[sscce]: http://sscce.org
+
+Just modify your initial comment if you forgot anything! Not new comments.
+
+
+## Guidelines
+
+  - **Keep it concise.** Longer issues are harder to understand.
+  - **Keep it focused.** Solving three vague problems is harder than solving one specific problem.
+  - **Be friendly!** Everyone is working hard and trying to be effective.

.github/ISSUE_TEMPLATE.md

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+Issues are for bugs. If you have questions, ask them on a [community forum][comm]. Folks are friendly and happy to help!
+
+[comm]: discord.gg/reasonml 
+
+Please have a look at checklist before submitting issues:
+
+https://github.com/BuckleScript/bucklescript/blob/master/.github/CHECK_LIST.md