chore: Readme picture (#49)

* Added picture to the README

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Adjusted picture size in readme

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

* Slightly rotated picture for better alignment

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

---------

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>
Co-authored-by: Maksym Lysak <mly@zurich.ibm.com>

README.md

@@ -1,3 +1,9 @@
+<p align="center">
+  <a href="https://github.com/docling-project/docling-eval">
+    <img loading="lazy" alt="Docling" src="docs/assets/docling-eval-pic.png" width="40%"/>
+  </a>
+</p>
+
 # Docling-eval