doc: add github template (eggjs#7)

.github/ISSUE_TEMPLATE.md

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+<!--
+Thank you for reporting an issue. Please fill in as much of the template below as you're able.
+
+1. It's RECOMMENDED to submit PR for typo or tiny bug fix.
+2. If this's a BUG, please provide: course repetition, error log, platform, node/egg/plugin versions and configuration.
+3. If this's a FEATURE request, please provide: details, pseudo codes if necessary.
+
+感谢您向我们反馈问题。请尽量填写下面的模板。
+
+1. 我们推荐如果是小问题（错别字修改，小的 bug fix）直接提交 PR。
+2. 如果是一个 BUG，请提供：复现步骤，错误日志，node、egg、和相关插件的版本以及相关配置。
+3. 如果是一个新需求，请提供：详细需求描述，最好是有伪代码实现。
+-->
+
+* **Type**: <!-- BUG or FEATURE -->
+* **Node Version**:
+* **Egg Version**:
+* **Plugin Name**:
+* **Plugin Version**:
+* **Platform**:
+
+<!-- Enter your issue details below this comment. -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for your pull request. Please review below requirements.
+Bug fixes and new features should include tests and possibly benchmarks.
+Contributors guide: https://github.com/eggjs/egg/blob/master/CONTRIBUTING.md
+
+感谢您贡献代码。请确认下列 checklist 的完成情况。
+Bug 修复和新功能必须包含测试，必要时请附上性能测试。
+Contributors guide: https://github.com/eggjs/egg/blob/master/CONTRIBUTING.md
+-->
+
+##### Checklist
+<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->
+
+- [ ] `npm test` passes
+- [ ] tests and/or benchmarks are included
+- [ ] documentation is changed or added
+- [ ] commit message follows commit guidelines
+
+##### Affected core subsystem(s)
+<!-- Provide affected core subsystem(s). -->
+
+
+##### Description of change
+<!-- Provide a description of the change below this comment. -->