Add debugging sandbox for the purpose of debugging miniaudio.

tests/debugging/debugging.cpp

@@ -0,0 +1,10 @@
+/* This is just a sandbox for debugging miniaudio. Do not run this as part of some automated testing process. */
+#include "../../miniaudio.c"
+
+int main(int argc, char** argv)
+{
+    (void)argc;
+    (void)argv;
+
+    return 0;
+}