add issue template (#8)

Author: WangXin008

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: "\U0001F91D Bug Report"
+about: As a User, I want to report a Bug.
+labels: type/bug
+---
+
+## Bug Report
+
+Please answer these questions before submitting your issue. Thanks!
+
+### 1. Minimal reproduce step (Required)
+
+<!-- a step by step guide for reproducing the bug. -->
+
+### 2. What did you expect to see? (Required)
+
+### 3. What did you see instead (Required)
+
+### 4. What is your timer version? (Required)

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: "\U0001F44F Feature Request"
+about: As a user, I want to request a New Feature on the product.
+labels: type/feature-request
+---
+
+## Feature Request
+
+**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 feature 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. -->
+
+**Teachability, Documentation, Adoption, Migration Strategy:**
+<!-- If you can, explain some scenarios how users might use this, situations it would be helpful in. Any API designs, mockups, or diagrams are also helpful. -->

.github/ISSUE_TEMPLATE/general-question.md

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+---
+name: "\U0001F600 Ask a Question"
+about: I want to ask a question.
+labels: type/question
+---
+
+## General Question
+
+<!--
+
+Before asking a question, make sure you have:
+
+- Searched existing Stack Overflow questions.
+- Googled your question.
+- Searched open and closed [GitHub issues](https://github.com/antlabs/timer/issues)
+- Read the documentation:
+  - [timer Readme](https://github.com/antlabs/timer/blob/master/README.md)
+
+-->