feat: add pr and issue template (#69)

Author: thinkasany

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 'Bug report（缺陷问题反馈）'
+about: 'Report a bug to help us improve'
+title: '[Bug] say something'
+labels: ''
+assignees: ''
+---
+
+<!--
+感谢您向我们反馈问题，为了高效的解决问题，我们期望你能提供以下信息：
+-->
+
+## What happens?
+
+<!-- A clear and concise description of what the bug is. -->
+<!-- 清晰的描述下遇到的问题。-->
+
+
+<!-- 为节约大家的时间，无复现步骤的 ISSUE 会被关闭，提供之后再 REOPEN -->
+
+## How To Reproduce
+
+**Steps to reproduce the behavior:** 1. 2.
+
+**Expected behavior** 1. 2.
+
+<!-- 请提供复现链接/步骤，错误日志以及相关配置 -->
+
+## Context
+
+- **leetcode-practice Version**:
+- **Node Version**:
+- **Platform**:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 'Feature request（新需求）'
+about: 'Suggest an idea for this project'
+title: '[Feature Request] say something'
+labels: ''
+assignees: ''
+---
+
+## Background
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Proposal
+
+Describe the solution you'd like, better to provide some pseudo code.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## Git Commit Message Convention
+
+> This is adapted from [Angular's commit convention](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-changelog-angular).