Added code formatting

README.md

@@ -3,10 +3,12 @@ This is a Raytracing made from scratch in C++, using a C++ wrapper of Allegro I
 
 
 # How to build :
-Compile using : -std=c++11 -lpthread;allegro;allegro_image;allegro_primitives;allegro_memfile;allegro_ttf;allegro_font
--Wl,--format=binary -Wl,arial.ttf -Wl,--format=default
+Compile using :
+```bash
+-std=c++11 -lpthread;allegro;allegro_image;allegro_primitives;allegro_memfile;allegro_ttf;allegro_font -Wl,--format=binary -Wl,arial.ttf -Wl,--format=default
+```
 
-The last line is required to include the arial.ttf file __inside__ the executable, at link time. This avoids having to share your program and the font file as two separate files.
+The last line is required to include the arial.ttf file _inside_ the executable, at link time. This avoids having to share your program and the font file as two separate files.
 
-The optimisation level -O2 is highly recommended as it's 5 times as performant as lesser ones. Also -O3 and higher causes weird shadows glitches I didn't identify yet.
+The optimisation level `-O2` is highly recommended as it's 5 times as performant as lesser ones. Also `-O3` and higher causes weird shadows glitches I didn't identify yet.