Added CMakeLists.txt for esp-idf component

CMakeLists.txt

@@ -1,4 +1,9 @@
+set(headers
+    TFT_eSPI.h
+)
 
-idf_component_register(SRCS "TFT_eSPI.cpp"
-                    INCLUDE_DIRS "."
-                    PRIV_REQUIRES arduino)
+set(sources
+    TFT_eSPI.cpp
+)
+
+idf_component_register(INCLUDE_DIRS . SRCS ${headers} ${sources} REQUIRES arduino-esp32 freertos esp_system)