Added test case bingding Rust -> C++ calls.

Author: Reim-developer

rustlib_test/main.cxx

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <string>
+
+using std::cout;
+using std::endl;
+using std::string;
+
+extern "C" {
+    void greet();
+    char *get_reim_name();
+    void free_name(char *name);
+}
+
+int main() {
+    greet();
+
+    auto raw_name = get_reim_name();
+    auto name_string = string(raw_name);
+    free_name(raw_name);
+
+    cout << name_string << endl;
+}