Update applications.rst

Author: Evolutionary-Intelligence

docs/sphinx/source/applications.rst

@@ -124,6 +124,9 @@ Open-Source Cases
 Till now, this Python library `PyPop7` has been required and/or introduced
 (at least) in the following **open-source** projects on **GitHub**:
 
+* **22**: https://github.com/LijunSun90/Knowledge_with_Codes
+
+  * `from pypop7.optimizers.pso.spso import SPSO as PSO`
 * **21**: https://github.com/XAI-liacs/BLADE
 
   * `pyproject.toml`: `pypop7 = "^0.0.79"`