List dependencies on README

README.md

@@ -2,6 +2,16 @@
 
 ECN lab about syntaxic analysis
 
+## Dependencies
+
+You need **GCC**, **flex** and **bison**.
+
+You can install them on debian based systems with :
+
+```
+sudo apt install flex bison
+```
+
 ## How to compile
 
 ```