chore: update gitignore for generated files

.gitignore

@@ -1,4 +1,16 @@
+# Generated documentation
+docs/
+
+# Logs
+*.log
+
+# Cache directories
+.cache/
+
 # ---> C++
+# compilation database
+compile_commands.json
+
 # Prerequisites
 *.d
 

Makefile

@@ -31,3 +31,4 @@ clean:
 	$(MAKE) -C tests clean
 
 include docker.mk
+include docs.mk

docs.mk

@@ -0,0 +1,9 @@
+DOXYGEN_CONFIG := Doxyfile
+
+.PHONY: docs docs-clean
+
+docs:
+	doxygen $(DOXYGEN_CONFIG)
+
+docs-clean:
+	rm -rf docs