docs: Update issue templates

The github have already support different issue template. I added three:

* bug report
* feature request
* questions about PouchContainer

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,31 @@
+---
+name: Bug Report
+about: Create a report to help us improve
+
+---
+
+### Ⅰ. Issue Description
+
+
+### Ⅱ. Describe what happened
+
+
+### Ⅲ. Describe what you expected to happen
+
+
+### Ⅳ. How to reproduce it (as minimally and precisely as possible)
+
+1.
+2.
+3.
+
+### Ⅴ. Anything else we need to know?
+
+
+### Ⅵ. Environment:
+
+- pouch version (use `pouch version`):
+- OS (e.g. from /etc/os-release):
+- Kernel (e.g. `uname -a`):
+- Install tools:
+- Others:

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,16 @@
+---
+name: Feature Request
+about: Suggest an idea for this project
+
+---
+
+## Why you need it?
+<!-- Is your feature request related to a problem? Please describe in details  -->
+
+
+## How it could be?
+<!--A clear and concise description of what you want to happen. For a computer fan,  you can explain more about input of the feature, and output of it.-->
+
+
+## Other related information
+<!-- Add any other context or screenshots about the feature request here.-->

.github/ISSUE_TEMPLATE/question-about-pouchcontainer.md

@@ -0,0 +1,8 @@
+---
+name: Question about PouchContainer
+about: Ask whatever you want to know or confusion about PouchContainer
+
+---
+
+## Question
+<!-- You can ask any question about this project -->