doc: use 3 issue template for better community experience

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report (反馈 Bug)
+about: Create a bug report to help HugeGraph improve
+title: '[Bug] Briefly describe the main problem here'
+labels: 'bug'
+assignees: ''
+
+---
+
+### Note ( 特别注意 ) : 
+
+> 1. 请先**搜索**, 并**确认**现有的 [Issues](https://github.com/hugegraph/hugegraph/issues) 与 [FAQ](https://hugegraph.github.io/hugegraph-doc/guides/faq.html) 中没有与您相同 / 相关的问题, 请勿重复提交
+> 2. 我们需要尽可能**详细**的信息来**复现**问题, 越详细的信息 (包括**日志 / 截图 / 配置**等) 会**越快**被响应和处理
+> 3. 请关注提交的 issue, 缺乏信息 / 长时间 ( > 14 天) 没有回复, issue 可能会被 **关闭** (需要时可再开启)
+
+
+## Environment ( 环境信息 - 必填 )
+- **Server Version**: v0.11.x (refer [here](https://hugegraph.github.io/hugegraph-doc/clients/restful-api/other.html))
+- **Backend**: Cassandra 3.x, x nodes, HDD or SSD
+- **OS**: xx CPUs, xx G RAM, Centos 7.x
+- **Data Size**:  xx vertices, xx edges (like 1000W 点, 9000W 边)
+
+## Expected behavior ( 期望表现 )
+
+xxx
+
+## Actual behavior ( 实际表现 / 报错)
+
+xxx
+
+```java
+// Error info ⬇ (尽可能详细的日志 + 完整异常栈)
+
+```
+
+## How to reproduce ( 复现步骤 )
+1. step 1
+2. step 2
+3. step 3
+
+**Refer:** [How to create a minimal reproducible Example](https://stackoverflow.com/help/minimal-reproducible-example)
+
+### Vertex/Edge example ( 问题点 / 边数据举例 )
+
+```javascript
+// JSON of Vertex / Edge ⬇
+
+```
+
+### Schema [VertexLabel, EdgeLabel, IndexLabel] ( 元数据结构 )
+
+```javascript
+// JSON of GraphSchema ⬇
+
+```

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+
+# 设置提 issue 前的参考文档
+contact_links:
+  - name: HugeGraph Server Doc
+    url: https://hugegraph.github.io/hugegraph-doc/quickstart/hugegraph-server.html
+    about: Please search question here before opening a new issue
+  - name: HugeGraph API Doc
+    url: https://hugegraph.github.io/hugegraph-doc/clients/hugegraph-api.html
+    about: Please search usage here before opening a new issue

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request (新需求 / 功能)
+about: Give an idea for HugeGraph
+title: '[Feature] Briefly describe the new features'
+labels: 'feature'
+assignees: ''
+---
+
+## Feature Description: 
+
+xxx

.github/ISSUE_TEMPLATE/question_ask.md

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+---
+name: Ask question (提问)
+about: Question about usage or configs in HugeGraph
+title: '[Question] Briefly describe your problems here'
+labels: ''
+assignees: ''
+
+---
+
+### Note ( 特别注意 ) : 
+
+> 1. 请先**搜索**, 并**确认**现有的 [Issues](https://github.com/hugegraph/hugegraph/issues) 与 [FAQ](https://hugegraph.github.io/hugegraph-doc/guides/faq.html) 中没有与您相同 / 相关的问题, 请勿重复提交
+> 2. 我们需要尽可能**详细**的信息来**分析**问题, 越详细的信息 (包括**日志 / 截图 / 配置**等) 会**越快**被响应和处理
+> 3. 请关注提交的 issue, 缺乏信息 / 长时间 ( > 14 天) 没有回复, issue 可能会被 **关闭** (需要时可再开启)
+
+
+## Environment ( 环境信息 - 必填 )
+- **Server Version**: v0.11.x (refer [here](https://hugegraph.github.io/hugegraph-doc/clients/restful-api/other.html))
+- **Backend**: Cassandra 3.x, x nodes, HDD or SSD
+- **OS**: xx CPUs, xx G RAM, Centos 7.x
+- **Data Size**:  xx vertices, xx edges (like 1000W 点, 9000W 边)
+
+## Your Question ( 问题描述 )
+
+xxx
+
+> 注: 图使用 / 配置相关问题, 请优先参考 [REST-API 文档](https://hugegraph.github.io/hugegraph-doc/clients/hugegraph-api.html), 以及 [Server 配置文档](https://hugegraph.github.io/hugegraph-doc/config/config-option.html)
+
+### Related information ( 补充相关信息 ) :
+<details>
+<summary> Provide related "Data & Schema" info (Click to expand) </summary>
+
+### Vertex/Edge example ( 问题点 / 边数据举例 )
+
+```javascript
+// JSON of Vertex / Edge ⬇
+
+```
+
+### Schema [VertexLabel, EdgeLabel, IndexLabel] ( 元数据结构 )
+
+```javascript
+// JSON of GraphSchema ⬇
+
+```
+</details>