Add macos/ios app using rust lib

FastCoster/CosterRs/libcoster_rs.h

@@ -0,0 +1,8 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+char *move_money_from_text(const char *rules, const char *lines, bool use_numeric_accounts);
+
+void move_money_from_text_free(char *s);