issue template (#1475)

ISSUE_TEMPLATE.md

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+For bugs or installation issues, please provide the following information.
+The more information you provide, the more easily we will be able to offer
+help and advice.
+
+## Environment info
+Operating System:
+
+Compiler:
+
+Package used (python/R/jvm/C++):
+
+`xgboost` version used:
+
+If installing from source, please provide 
+
+1. The commit hash (`git rev-parse HEAD`)
+2. Logs will be helpful (If logs are large, please upload as attachment).
+
+If you are using python package, please provide
+
+1. The python version and distribution
+2. The command to install `xgboost` if you are not installing from source
+
+If you are using R package, please provide
+
+1. The R `sessionInfo()`
+2. The command to install `xgboost` if you are not installing from source
+
+## Steps to reproduce
+
+1.
+2.
+3.
+
+## What have you tried?
+
+1.
+2.
+3.