[#noissue] add agent-plugins readme

[jaehong-kim]

No description provided.

[codecov]

Codecov Report

Merging #9492 (704e221) into master (ba4025a) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #9492      +/-   ##
============================================
- Coverage     38.92%   38.91%   -0.02%     
+ Complexity    11760    11754       -6     
============================================
  Files          3447     3447              
  Lines         92327    92327              
  Branches      10266    10266              
============================================
- Hits          35941    35928      -13     
- Misses        53278    53290      +12     
- Partials       3108     3109       +1     

Impacted Files	Coverage Δ
...p/pinpoint/rpc/client/WriteFailFutureListener.java	56.25% <0.00%> (-25.00%)	⬇️
...rp/pinpoint/rpc/packet/ControlHandshakePacket.java	44.82% <0.00%> (-24.14%)	⬇️
...vercorp/pinpoint/rpc/packet/ClientClosePacket.java	46.66% <0.00%> (-6.67%)	⬇️
.../pinpoint/metric/common/pinot/PinotDataSource.java	45.45% <0.00%> (-4.55%)	⬇️
...tor/metric/datasource/DefaultDataSourceMetric.java	85.18% <0.00%> (-3.71%)	⬇️
...om/navercorp/pinpoint/rpc/codec/PacketDecoder.java	51.66% <0.00%> (-1.67%)	⬇️
...orp/pinpoint/rpc/server/DefaultPinpointServer.java	79.83% <0.00%> (-0.83%)	⬇️
...pinpoint/profiler/monitor/DeadlockMonitorTask.java	21.59% <0.00%> (+1.13%)	⬆️
...p/pinpoint/rpc/stream/StreamChannelRepository.java	78.94% <0.00%> (+21.05%)	⬆️

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