Added explanation to override fopen if using external headers like dr_mp3

Working-for-Android.md

@@ -289,6 +289,24 @@ when compiling,if report "fatal error: 'asm/types.h' file not found ",
 you need copy "asm-generic" and renamed as "asm".
 (the path "D:\Program_Files\android_sdk\ndk\25.0.8775105\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\include\asm-generic")
 
+> [!NOTE]
+> If you need to load files using a external header like `dr_mp3` please consider overriding the `fopen` to `android_fopen` using a linker wrap.
+> 1. **Using Make**
+>       -  `-Wl,--wrap=fopen`
+> 2. **Using CMake**
+>       -  `target_link_options(${APP_LIB_NAME} PRIVATE "-Wl,--wrap=fopen")`
+> - If you need to override the fopen using linker wrap here is the implementation sample:
+> ```c99
+> #include <stdio.h>
+> // This makes a signature for the android_fopen that will be implemented on rcore_android.c
+> extern FILE *android_fopen(const char *fileName, const char *mode);
+> 
+> // The linker wrap will override the function on it to __wrap_(name)
+> FILE* __wrap_fopen(const char* path, const char* mode) {
+>     // Call the rcore_android android_fopen function
+>     return android_fopen(path, mode);
+> }
+> ```
 
 **If you have any doubt, [just let me know][raysan5].**