Create issue templates

Add template for Bug report, Feature request, General question.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: a:bug
+assignees: ''
+
+---
+
+**Prerequisites**
+ - [ ] I made sure I am running the latest [development build](https://ci.appveyor.com/project/ORelio/minecraft-console-client/build/artifacts)
+ - [ ] I tried to [look for similar issues](https://github.com/ORelio/Minecraft-Console-Client/issues?q=is%3Aissue) before opening an new one
+ - [ ] I have set `debugmessages=true` in config to diagnose my issue
+ - [ ] I have redacted session tokens and passwords before attaching screenshots
+
+**Bug description**
+A bug report should contain the following items:
+* A clear and concise description of what the bug is
+* Steps to reproduce the behavior
+* What I expected to happen instead
+* If applicable, add screenshots to help explain your problem
+* Specify which kind of operating system you are running

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: a:enhancement, a:new-feature
+assignees: ''
+
+---
+
+**Prerequisites**
+ - [ ] I have read and understood the [user manual](https://github.com/ORelio/Minecraft-Console-Client/tree/master/MinecraftClient/config)
+ - [ ] I made sure I am running the latest [development build](https://ci.appveyor.com/project/ORelio/minecraft-console-client/build/artifacts)
+ - [ ] I tried to [look for similar feature requests](https://github.com/ORelio/Minecraft-Console-Client/issues?q=is%3Aissue) before opening an new one
+
+**Feature description**
+A feature request should contain the following items:
+* A concise description of your problem (I'm always frustrated when [...])
+* A clear description of what you want to happen (I'd like the app to do this to solve my problem [...])
+* Any alternative solutions or features you've considered.
+* If applicable, add screenshots to help explain your request

.github/ISSUE_TEMPLATE/general-question.md

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+---
+name: General Question
+about: Request help for using the program
+title: ''
+labels: a:question
+assignees: ''
+
+---
+
+**Prerequisites**
+ - [ ] I have read and understood the [user manual](https://github.com/ORelio/Minecraft-Console-Client/tree/master/MinecraftClient/config)
+ - [ ] I made sure I am running the latest [development build](https://ci.appveyor.com/project/ORelio/minecraft-console-client/build/artifacts)
+ - [ ] I tried to [look for similar questions](https://github.com/ORelio/Minecraft-Console-Client/issues?q=is%3Aissue) before creating an new one
+
+**Description of the Questions**
+Your question may contain the following items:
+* A concise description of your problem (I'm always frustrated when [...])
+* A clear description of what you want to happen (I'd like the app to do this to solve my problem [...])
+* Any solutions or features you've already considered (I tried to set this setting in config [...]).
+* If applicable, add screenshots to help explain your question