Adding a README to task2

hw4/task2/README.md

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+# Homework hw4 task2
+
+Some hints, to solve this task with Rust:
+
+- Have a look into the [std::mem] module.
+- Timings with the external crate [time][] is more constructive than the methods in the standard library.
+
+[time]: https://docs.rs/time
+[std::mem]: https://doc.rust-lang.org/std/mem/