Update CP2K links

README.md

@@ -82,6 +82,7 @@ The application codes that constitute the UEABS are:
         <ul>
           <li><a href="https://www.cp2k.org/">CP2K website</a></li>
           <li><a href="https://github.com/cp2k/cp2k/releases">Source code</a></li>
+          <li><a href="./cp2k/README.md">Build instructions</a></li>
           <li><a href="./cp2k/benchmarks/TestCaseA_H2O-512">Testcase A</a></li>
           <li><a href="./cp2k/benchmarks/TestCaseB_LiH-HFX">Testcase B</a></li>
           <li><a href="./cp2k/benchmarks/TestCaseC_H2O-DFT-LS">Testcase C</a></li>