newbie js exercise for session 16

Author: adolivaresl

exercises/lone-sum/README.md

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+---
+difficulty:
+  - newbie
+OAs:
+  - conditionals
+projects:
+  - cipher
+  - card-validation
+---
+
+# loneSum
+
+[https://the-winter.github.io/codingjs/exercise.html?name=loneSum&title=Logic-2](https://the-winter.github.io/codingjs/exercise.html?name=loneSum&title=Logic-2)
+
+Dados 3 valores a b c, devuelve su suma.
+Sin embargo, si uno de los valores es igual a otro de los valores,
+no cuenta para la suma.
+
+**Ejemplo**
+
+```js
+    loneSum(1, 2, 3) → 6
+    loneSum(3, 2, 3) → 2
+    loneSum(3, 3, 3) → 0
+```

exercises/lone-sum/README.pt-BR.md

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+---
+difficulty:
+  - newbie
+OAs:
+  - conditionals
+projects:
+  - cipher
+  - card-validation
+---
+
+# loneSum
+
+[https://the-winter.github.io/codingjs/exercise.html?name=loneSum&title=Logic-2](https://the-winter.github.io/codingjs/exercise.html?name=loneSum&title=Logic-2)
+
+Dados 3 valores int, a b c, retornam sua soma.
+No entanto, se um dos valores for igual a outro dos valores,
+não conta para a soma.
+
+**Exemplo**
+
+```js
+    loneSum(1, 2, 3) → 6
+    loneSum(3, 2, 3) → 2
+    loneSum(3, 3, 3) → 0
+```