feat(js): add solution and documentation for easy challenge 10 - Even or odd detector

Author: IbatoLionDev

1-EASY/JavaScript/10-even-or-odd-detector/article.md

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+# Challenge Description and Solution
+
+## English Version
+
+### Challenge Description
+Write a function that determines if a number is even or odd. Test with different types of inputs (positive numbers, negative numbers, and zero) to ensure robustness.
+
+### Code Explanation
+The `isEven` function uses the modulo operator `%` to determine if a number is even. If the remainder of the division of the number by 2 is zero, the number is even; otherwise, it is odd.
+
+### Relevant Code Snippet
+
+```javascript
+function isEven(n) {
+    return n % 2 === 0;
+}
+```
+
+### Example Usage
+
+```javascript
+const testValues = [0, 1, -1, 2, -2, 15, -15];
+testValues.forEach(val => {
+    const result = isEven(val) ? "even" : "odd";
+    console.log(`${val} is ${result}`);
+});
+```
+
+---
+
+## Versión en Español
+
+### Descripción del Reto
+Escribe una función que determine si un número es par o impar. Prueba con diferentes tipos de entradas (números positivos, negativos y cero) para asegurar la robustez.
+
+### Explicación del Código
+La función `isEven` utiliza el operador módulo `%` para determinar si un número es par. Si el residuo de la división entre el número y 2 es cero, el número es par; de lo contrario, es impar.
+
+### Fragmento de Código Relevante
+
+```javascript
+function isEven(n) {
+    return n % 2 === 0;
+}
+```
+
+### Ejemplo de Uso
+
+```javascript
+const testValues = [0, 1, -1, 2, -2, 15, -15];
+testValues.forEach(val => {
+    const result = isEven(val) ? "even" : "odd";
+    console.log(`${val} is ${result}`);
+});

1-EASY/JavaScript/10-even-or-odd-detector/proposed-solution/main.js

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+// Challenge: Write a function that determines if a number is even or odd. Test with different types of inputs (positive numbers, negative numbers, and zero) to ensure robustness.
+
+function isEven(n) {
+    return n % 2 === 0;
+}
+
+// Example usage
+const testValues = [0, 1, -1, 2, -2, 15, -15];
+testValues.forEach(val => {
+    const result = isEven(val) ? "even" : "odd";
+    console.log(`${val} is ${result}`);
+});