clarify fusion subject with examples

subjects/fusion/README.md

@@ -5,9 +5,35 @@
 The objective of this exercise is to merge objects into a new object depending on the values type
 
 With this create a function called `fusion` that:
+
 - If the type is an array you must concat it
+
+```js
+fusion([1,2], [3,4]) // -> [1,2,3,4]
+``` 
+
 - If it is a string you must concatenate with a space
+
+```js
+fusion('Salem', 'alem') // -> 'Salem alem'
+``` 
+
 - If it is numbers you must added them
+
+```js
+fusion(4, 11) // -> 15
+```
+
+- In case of type mismatch you must replace it with the value of the second object
+
+```js
+fusion({ a: 'hello', b: [] }, { a: 4 })
+// -> { a: 4, b: [] }
+```
+
 - If it is an object you must fusion them recursively
-- In case of other types you must replace it with the value of the second object
-- In case the value don't match you must replace it with the value of the second object
+
+```js
+fusion({ a: 1, b: { c: 'Salem' } }, { a: 10, x: [], b: { c: 'alem' } })
+// -> { a: 11, x: [], b: { c: 'Salem alem' } }
+```