PCP: Sign Up

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Personal sign up,
A learner
allenng1995@gmail.com

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You've signing up successfully, go finding some tasks here
TiDB Issues：https://github.com/pingcap/tidb/projects/26
TiKV Issues：https://github.com/tikv/tikv/projects/20
PD Issues：https://github.com/pingcap/pd/projects/2.