Added DownloadFile function example

examples/core/core_download_file.c

@@ -0,0 +1,19 @@
+// Example written by Rabia Alhaffar in 14/June/2020
+// To know how to use DownloadFile function
+
+#include <raylib.h>
+
+const char *file2download = "https://raw.githubusercontent.com/Rabios/raylib/master/src/core.c";
+
+int main(void) {
+    InitWindow(0,0,"DOWNLOAD FILE!!!");
+    DownloadFile(file2download,"made_with_example");
+    while(!WindowShouldClose()) {
+        BeginDrawing();
+            ClearBackground(WHITE);
+            DrawText("FILE DOWNLOADED SUCCESSFULLY!!!",10,10,32,BLACK);
+        EndDrawing();        
+    } 
+    CloseWindow();
+    return 0;
+}