add issue template (neo-project#250)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to detail an error or unexpected behavior
+title: ''
+labels: ''
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open the project, run '...'
+2. Type '...' or do '...'
+3. ...
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Platform:**
+ - OS: [e.g. Windows 10 x64]
+ - Version [e.g. neo-cli 2.10.2]
+
+**(Optional) Additional context**
+Add any other context about the problem here.
+
+However, if your issue does not fit these aforementioned criteria, or it can be understood in another manner, feel free to open it in a different format. 

.github/ISSUE_TEMPLATE/feature-or-enhancement-request.md

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+---
+name: Feature or enhancement request
+about: Suggest an idea for Neo
+title: ''
+labels: discussion
+assignees: ''
+---
+
+**Summary or problem description**
+A summary of the problem you want to solve or metric you want to improve
+
+**Do you have any solution you want to propose?**
+A clear and concise description of what you expect with this change.
+
+**Where in the software does this update applies to?**
+- Compiler
+- Consensus
+- CLI
+- Plugins
+- Ledger
+- Network Policy
+- P2P (TCP)
+- RPC (HTTP)
+- SDK
+- VM
+- Other:
+

.github/ISSUE_TEMPLATE/questions.md

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+---
+name: Questions
+about: Questions about Neo Platform
+title: ''
+labels: question
+assignees: ''
+---
+
+**Delete this: We would like to use GitHub for bug reports and feature requests only however if you are unable to get support from our team in: our [Discord](https://discord.io/neo) server or in our [offical documentation](https://docs.neo.org/docs/en-us/index.html), feel encouraged to create an issue here on GitHub.**