Some cleanup

Adds the poincare README.
Removes a useless include in poincare/include/poincare/fraction_layout.hpp

Change-Id: Id4e4625b69df5eac6b7d6a58cb91c7331a0f7205

poincare/README.txt

@@ -0,0 +1,20 @@
+Things we will want to simplify:
+
+ 2.y.3 -> 6.y
+ y.x.3 + x^2 +1 -> x^2 + 3*x*y + 1
+Zeroes and ones
+ x + 0 -> x
+ 1*x -> x
+ x^1 -> x
+ x^0 -> 1
+Simplify fractions
+ (x^2+5.x+6)/(x+2) -> x+3
+Polynomials
+ (x+1)^2-x^2 -> 2*x+1
+Fractions
+ (2*x)/(x^2-1) - 1/(x-1) -> 1/(x+1)
+Functional identities
+  ln(2x) - ln(x) -> ln(2)
+  y*sin^2(x) + y*cos^2(x) -> y
+
+Note : The simplification process can be interrupted! -> It probably browses a graph

poincare/src/layout/fraction_layout.cpp

@@ -1,4 +1,3 @@
-#include <poincare/fraction.h>
 #include <string.h>
 #include <assert.h>
 #include "fraction_layout.h"