add code quality badge

Author: vancraar

README.md

@@ -1,5 +1,5 @@
 
-# Least-Squares Support-Vector Machine   [![Generate documentation](https://github.com/SC-SGS/PLSSVM/actions/workflows/documentation.yml/badge.svg)](https://vancraar.github.io/PLSSVM/)   [![Build Status Linux CPU + GPU](https://simsgs.informatik.uni-stuttgart.de/jenkins/buildStatus/icon?job=PLSSVM%2FMultibranch-Github%2Fmain&subject=Linux+CPU/GPU)](https://simsgs.informatik.uni-stuttgart.de/jenkins/view/PLSSVM/job/PLSSVM/job/Multibranch-Github/job/main/)   [![Windows CPU](https://github.com/SC-SGS/PLSSVM/actions/workflows/msvc_windows.yml/badge.svg)](https://github.com/SC-SGS/PLSSVM/actions/workflows/msvc_windows.yml)
+# Least-Squares Support-Vector Machine   [![Codacy Badge](https://app.codacy.com/project/badge/Grade/e780a63075ce40c29c49d3df4f57c2af)](https://www.codacy.com/gh/SC-SGS/PLSSVM/dashboard?utm_source=github.com&utm_medium=referral&utm_content=SC-SGS/PLSSVM&utm_campaign=Badge_Grade)   [![Generate documentation](https://github.com/SC-SGS/PLSSVM/actions/workflows/documentation.yml/badge.svg)](https://vancraar.github.io/PLSSVM/)   [![Build Status Linux CPU + GPU](https://simsgs.informatik.uni-stuttgart.de/jenkins/buildStatus/icon?job=PLSSVM%2FMultibranch-Github%2Fmain&subject=Linux+CPU/GPU)](https://simsgs.informatik.uni-stuttgart.de/jenkins/view/PLSSVM/job/PLSSVM/job/Multibranch-Github/job/main/)   [![Windows CPU](https://github.com/SC-SGS/PLSSVM/actions/workflows/msvc_windows.yml/badge.svg)](https://github.com/SC-SGS/PLSSVM/actions/workflows/msvc_windows.yml) 
 
 Implementation of a parallel [least-squares support-vector machine](https://en.wikipedia.org/wiki/Least-squares_support-vector_machine) using multiple different backends.
 The currently available backends are:
@@ -315,4 +315,4 @@ add_executable(prog main.cpp)
 
 target_compile_features(prog PUBLIC cxx_std_17)
 target_link_libraries(prog PUBLIC plssvm::svm-all)
-```
+```