doc: add ant codespaces badge

[hacke2]

Motivation:

Enable sofa-rpc to support Web IDE for browsing code.

Modification:

Added ant codespaces badge to support Web IDE.

Result:

[sofastack-cla]

Hi @hacke2, welcome to SOFAStack community, Please sign Contributor License Agreement!

After you signed CLA, we will automatically sync the status of this pull request in 3 minutes.

[nobodyiam]

@hacke2 please sign the cla first, thanks!

[nobodyiam]

LGTM

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (666261d) 72.03% compared to head (c06a10f) 72.01%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1370      +/-   ##
============================================
- Coverage     72.03%   72.01%   -0.03%     
  Complexity      784      784              
============================================
  Files           416      416              
  Lines         17661    17661              
  Branches       2752     2752              
============================================
- Hits          12722    12718       -4     
- Misses         3537     3538       +1     
- Partials       1402     1405       +3     

Files	Coverage Δ
...fa/rpc/bootstrap/dubbo/DubboConsumerBootstrap.java	84.21% <100.00%> (ø)
...lipay/sofa/rpc/bootstrap/dubbo/DubboConvertor.java	90.00% <100.00%> (ø)
...fa/rpc/bootstrap/dubbo/DubboProviderBootstrap.java	54.05% <ø> (ø)
...lipay/sofa/rpc/bootstrap/dubbo/DubboSingleton.java	88.88% <100.00%> (ø)
.../main/java/com/alipay/sofa/rpc/common/Version.java	100.00% <ø> (ø)
.../alipay/sofa/rpc/log/factory/RpcLoggerFactory.java	77.77% <ø> (ø)
...alipay/sofa/rpc/registry/local/DomainRegistry.java	94.26% <100.00%> (ø)

... and 11 files with indirect coverage changes

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[EvenLjj]

LGTM