Add issue template (lunchclass#188)

Because we do not have templates, we have to enter all the content
directly. So I want to add a template.

ISSUE=lunchclass#176

docs/issue_template.md

@@ -0,0 +1,32 @@
+**I'm submitting a ...**
+  - [ ] bug report
+  - [ ] feature request
+  - [ ] support request
+
+## General infomration
+### Prerequisites
+* [ ] Are you running the latest version?
+
+### Description
+[Description of the bug or feature]
+
+### Steps to Reproduce
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+## Context (Environment)
+### Operating System
+* [ ] Linux (x86/x64)
+* [ ] OSX (x86/x64)
+* [ ] Windows (x86/x64)
+* [ ] Linux (ARM)
+
+### Additional Information on the environment
+[Descripe your environment a bit more detailed]
+
+[You can erase any parts of this template not applicable to your Issue.]