Add job scheduler

Author: yingfeng

README.md

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     <b>Coding Tasks for Infiniflow Candidates</b>
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 ## A curated list of programming challenges
 
 - [language-identification](https://github.com/infiniflow/coding-tasks/tree/main/language-identification)
 - [sigmod 2018](https://github.com/infiniflow/coding-tasks/tree/main/sigmod-2018)
 - [simhash-matching](https://github.com/infiniflow/coding-tasks/tree/main/simhash-matching)
 - [wavelet-tree](https://github.com/infiniflow/coding-tasks/tree/main/wavelet-tree)
 - [air-quality-classification](https://github.com/infiniflow/coding-tasks/tree/main/air-quality-classification)
+- [job-scheduler](https://github.com/infiniflow/coding-tasks/tree/main/job-scheduler)