add issue template

[Fatman13]

关联的Issues (Related Issues)

close #359

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Merging #361 (0658f2a) into master (34a7277) will decrease coverage by 0.04%.
The diff coverage is 20.41%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
- Coverage   20.81%   20.78%   -0.04%     
==========================================
  Files         190      193       +3     
  Lines       23086    23359     +273     
==========================================
+ Hits         4806     4855      +49     
- Misses      17501    17718     +217     
- Partials      779      786       +7     

Flag	Coverage Δ
unittests	20.78% <20.41%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cli/storage-deals.go	3.91% <0.00%> (ø)
cli/util.go	3.90% <0.00%> (ø)
dagstore/modules.go	0.00% <0.00%> (ø)
models/repo/repo.go	100.00% <ø> (ø)
rpc/rpc.go	0.00% <0.00%> (ø)
tools/index/main.go	0.00% <0.00%> (ø)
models/badger/shard.go	14.28% <14.28%> (ø)
config/save.go	36.00% <50.00%> (ø)
models/mysql/db.go	63.38% <50.00%> (+0.07%)	⬆️
dagstore/wrapper.go	41.89% <55.55%> (+0.01%)	⬆️
... and 6 more

... and 2 files with indirect coverage changes

[simlecode]

lgtm