Update README.md

Author: Jeffresh

README.md

@@ -1,2 +1,10 @@
-# Gradient-descent-feature-scaling
-A way to speed up gradient descent is having each feature in the same range.
+# Gradient descent feature scaling
+
+### Abstract
+A way to speed up gradient descent is having each feature in the same range. There are two ways to do that, one is feature scaling, and the other is mean normalization. We can mix toghether the two techniques using this formula:
+
+![equation](http://www.sciweavers.org/tex2img.php?eq=X%5C_normalized%20%3D%20%5Cfrac%7BX_i%20-%5Cmu_i%7D%7Bs_i%7D%0A&bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=0)
+
+
+
+# IN CONSTRUCTION