Update issue templates

Author: haorenW1025

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+- Please read through [this section](https://github.com/haorenW1025/completion-nvim/wiki/trouble-shooting) before posting a bug report.
+
+**My testing minimal init.vim**
+Post your init.vim to help me reproduce this issue
+
+**How to reproduce**
+Detailed step to reproduce this issue.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.