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Update README.md

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exercises/14/parameters/README.md
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@ -5,7 +5,7 @@
In this exercise we will look together at what happens when we change a reference
parameter to a value or a const reference.
Let's look at this function
Let's look at this function in [`Game.cpp`](../../../lib/Game.cpp)
```cpp
void Game::processEvents(InputState & inputState) {
@ -28,6 +28,8 @@ void Game::processEvents(InputState & inputState) {
## Exercise
You can follow along locally:
1. Make `inputState` a value. What happens when you compile the code? Can you explain why?
2. Now make it a `const` reference. What happens? Can you explain why?