Fixed linker bugs somehow?!

CMakeLists.txt

@@ -1,2 +1,19 @@
-idf_component_register(SRCS MFRC522_I2C.cpp INCLUDE_DIRS . REQUIRES arduino-esp32)
+set(headers
+    src/MFRC522_I2C.h
+)
+
+set(sources
+    src/MFRC522_I2C.cpp
+)
+
+idf_component_register(
+    INCLUDE_DIRS
+        src
+    SRCS
+        ${headers}
+        ${sources}
+    REQUIRES
+        arduino-esp32
+)
+
 target_compile_options(${COMPONENT_TARGET} PRIVATE -Wno-unused-but-set-variable)