docs(print_and_consume): description of exam exercise

subjects/print_and_consume/README.md

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+## print_and_consume
+
+### Instructions
+
+Create a function `print_and_consume` which takes a `String`, print the string with a new line at the end and consume it (the string can't be used after the function is called).
+
+Create a function `only_print` that takes a `String` and print it with a new line without consuming it.
+
+### Expected functions
+
+```rust
+pub fn print_and_consume(argument) {
+}
+
+pub fn only_print(argument) {
+}
+
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```rust
+use print_and_consume::*;
+
+fn main() {
+
+
+}
+```
+
+And its output:
+
+```console
+$ cargo run
+
+$
+```