initial version of SQIsign

Co-authored-by: Jorge Chavez-Saab <jorgechavezsaab@gmail.com>
Co-authored-by: Maria Corte-Real Santos <36373796+mariascrs@users.noreply.github.com>
Co-authored-by: Luca De Feo <github@defeo.lu>
Co-authored-by: Jonathan Komada Eriksen <jonathan.eriksen97@gmail.com>
Co-authored-by: Basil Hess <bhe@zurich.ibm.com>
Co-authored-by: Antonin Leroux <18654258+tonioecto@users.noreply.github.com>
Co-authored-by: Patrick Longa <plonga@microsoft.com>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Francisco Rodríguez-Henríquez <francisco.rodriguez@tii.ae>
Co-authored-by: Sina Schaeffler <108983332+syndrakon@users.noreply.github.com>
Co-authored-by: Benjamin Wesolowski <19474926+Calodeon@users.noreply.github.com>

.cmake/target_docs.cmake

@@ -0,0 +1,17 @@
+# Find Doxygen
+find_package(Doxygen)
+
+# Check if Doxygen is found
+if(DOXYGEN_FOUND)
+  # Set input and output directories
+  set(DOXYGEN_CONF ${PROJECT_SOURCE_DIR}/Doxyfile)
+
+  # Add a target to generate Doxygen documentation using 'make doc'
+  add_custom_target(doc
+    COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_CONF}
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    COMMENT "Generating API documentation with Doxygen"
+    VERBATIM )
+else()
+    message(FATAL_ERROR "Doxygen not found - can't generate docs.")
+endif(DOXYGEN_FOUND)