add notice file

[hubgeter]

All ASF projects are required to include a NOTICE file in every release.

[coveralls]

Pull Request Test Coverage Report for Build 15209068617

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 18 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+0.04%) to 62.664%

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Files with Coverage Reduction	New Missed Lines	%
com/baidu/bifromq/basecrdt/store/AntiEntropy.java	1	82.63%
com/baidu/bifromq/basekv/raft/RaftNodeStateLeader.java	1	85.23%
com/baidu/bifromq/inbox/server/InboxFetchPipeline.java	1	57.21%
com/baidu/bifromq/basekv/raft/RaftNodeStateFollower.java	2	83.99%
com/baidu/bifromq/basekv/store/stats/StatsCollector.java	2	78.95%
com/baidu/bifromq/inbox/server/scheduler/BatchInsertCall.java	2	80.56%
com/baidu/bifromq/dist/trie/TopicFilterIterator.java	3	69.85%
com/baidu/bifromq/basekv/store/range/KVRangeFSM.java	6	74.29%

Totals
Change from base Build 15201363607:	0.04%
Covered Lines:	23285
Relevant Lines:	35899

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💛 - Coveralls