Add GitHub issue template

ISSUE_TEMPLATE

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+
+# Environment
+
+## Vuls
+
+Hash : ____
+
+To check the commit hash of HEAD
+$ vuls -v
+
+or
+$ cd $GOPATH/src/github.com/future-architect/vuls 
+$ git rev-parse --short HEAD 
+
+## OS
+- Target Server: Write here
+- Vuls Server: Write here
+
+## Go
+- Go version: here
+
+# Current Output
+
+Please re-run the command using ```-debug``` and provide the output below.
+
+# Addition Details
+
+Can you also please fill in each of the remaining sections.
+
+## Expected Behavior
+
+## Actual Behavior
+
+## Steps to reproduce the behaviour
+
+