add issue template

[haoruilee]

for effective co-operation we need issue templates

[JohnG-mit]

The existing issue template still have bugs(e.g. links, contribution guide). We should modify the issue template and have a contribution guide.

[haoruilee]

With more contributors in this community, while most of them are new to git, we need to introduce "How to make a good PR" in the issue template.

You can refer to (Git commits历史是如何做到如此清爽的？ - 知乎
https://www.zhihu.com/question/61283395)

[haoruilee]

See this https://github.com/stevemao/github-issue-templates