Added and modified the ReadMe

ReadMe.md

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+# Rusty Jumpy
+
+Little platformer game to try and figure out a way to process collision from a grid
+
+## Run it
+
+You need to download Rust
+
+Then you clone this repository
+
+And launch it with :
+
+```Bash
+cargo build --release
+
+cargo run --release
+```
+
+## Controls
+
+W,A,S,D and Arrow Keys are for modifying the jump direction and force
+
+[DEBUG] Left Click teleports the ball to the cursors location.
+
+[DEBUG] Right Click cancels any velocity of the ball.
+
+[DEBUG] Press R to randomize the map (you can maintain the key pressed if you want to kill a friend who has photosensitive epilepsy)
+
+Tab toggles a debug mode where you can see the actual vector applied to the player wich is render as a cube to see its hitbox and tiles borders
+
+Spacebar jumps
+
+## How to play 
+
+You have one player in the window.
+When the player is on the ground you can aim with W,A,S,D (or arrow key) your next jump, then when you press Space you jump.