Update project_report.md

After the human needs have been successfully assigned for all essays, we evaluate the whole thing. In *human_needs_evaluation.py" we have written a code for evaluation. Here we calculate Precision, Accuracy, Recall and F1-Score and with these measurements we analyze the evaluation. Concrete comments and visualisations of the evaluation can be found in the jupyter notebook. 

<p align="center">

  <img src="Accuracy.png" />

  <img src="pictures/Accuracy.png" />

</p>

## The Tools and how they worked