added game compiling instructions, rules, improvements

README.md

@@ -3,5 +3,34 @@ This project is based on the Tetris game invented by Alekseï Pajitnov in 1984.
 The goal is to complete a maximum of lines in a grid with pieces (tetrominoes) that fall from the top.
 
 # Building on Windows
-This project works by compiling using Notepad++ for Raylib and adding the following files to the gcc command :
-```tetris-struct.c tetris-graph.c```
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+This project works by compiling using Notepad++ for Raylib and including the following files to the gcc command :
+```tetris-struct.c tetris-graph.c```
+
+# How to play
+## Rules
+The goal is to complete the maximum number of lines without reaching the top of the grid.\
+The score represents the number of lines completed.\
+The game starts at level 1. Every 10 lines the level increases and the pieces fall faster.
+
+## Commands
+```LEFT``` and ```RIGHT``` move the current falling piece to the left or to the right.\
+```DOWN``` accelerate the fall of the piece.\
+```A``` and ```Z``` (or ```Q``` and ```W``` on QWERTY) rotates the piece anticlockwise or clockwise.
+
+# Project contents
+```lib``` contains the raylib library (Windows version, need to be changed if used on other OS).\
+```src```contains all the raylib files.\
+```tetris-graph.c``` contains all the functions necessary for the graphical interface of the game.\
+```tetris-struct.c``` contains the implementation of the structure of the game.\
+```tetris-main.c``` contains the game main loop.\
+```tetris.data``` is read by the program to initialize the different tetrominoes.
+
+# Improvements
+## Features that could be added
+- A title screen with a start button and an option to change the commands.
+- A scoreboard stored in a file.
+- A score that takes into account the tetrises completed by giving bonus points.
+- A representation of the piece going next.
+## Known issues
+- The game can sometimes crash when spinning a piece at a specific time.
+- It is possible to overlap the fixed pieces in the grid when spinning a piece too fast.
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