Add a disclaimer to the README page & include a configuration file for GitHub settings.

[CalvinKirs]

See: https://cwiki.apache.org/confluence/display/INFRA/git+-+.asf.yaml+features

[coveralls]

Pull Request Test Coverage Report for Build 15340069701

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 16 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.07%) to 62.664%

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Files with Coverage Reduction	New Missed Lines	%
com/baidu/bifromq/basecluster/transport/TCPTransport.java	1	89.05%
com/baidu/bifromq/basecrdt/store/AntiEntropy.java	1	83.16%
com/baidu/bifromq/basekv/raft/RaftNodeStateFollower.java	1	82.62%
com/baidu/bifromq/starter/utils/ClusterDomainUtil.java	1	75.0%
com/baidu/bifromq/basecrdt/core/internal/VarLong.java	2	80.23%
com/baidu/bifromq/dist/trie/TopicFilterIterator.java	10	68.7%

Totals
Change from base Build 15339557412:	0.07%
Covered Lines:	23281
Relevant Lines:	35899

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💛 - Coveralls