message: add test script to the readme
diff: @@ -101,6 +101,14 @@ rustup target add aarch64-apple-ios # or any target below
  We will always aim to support the current stable version. However, it is
  likely that an older version of the Rust compiler is also supported.
  +# Running the tests
  +
  +`./test.sh`
  +
  +You can optionally run the tests with Valgrind by setting the environment variable **VALGRIND** to *true*
  +
  +`VALGRIND=true ./test.sh`
  +
  # License
  This project is licensed under either of the following licenses:
  