added 'Job Sequencing' to DIRECTORY.md

Author: showmyth

DIRECTORY.md

@@ -157,6 +157,7 @@
     * [Two Satisfiability](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/two_satisfiability.rs)
   * Greedy
     * [Stable Matching](https://github.com/TheAlgorithms/Rust/blob/master/src/greedy/stable_matching.rs)
+    * [Job Sequencing](https://github.com/TheAlgorithms/Rust/blob/master/src/greedy/job_sequencing.rs)
   * [Lib](https://github.com/TheAlgorithms/Rust/blob/master/src/lib.rs)
   * Machine Learning
     * [Cholesky](https://github.com/TheAlgorithms/Rust/blob/master/src/machine_learning/cholesky.rs)