<commit_before>## Tutorials

<details>
  <summary><a href="./tutorial/InstancesConstruction.md">
    Instances Construction 
  </a></summary>
    Routine `_.workpiece.construct` is used for instances construction.
</details><commit_msg>Added README.md file to the doc/eng folder 2<commit_after>## Tutorials

<details>
  <summary><a href="./tutorial/InstancesConstruction.md">
    Instances Construction 
  </a></summary>
    Routine <code>_.workpiece.construct</code> is used for instances construction.
</details>
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