Add solution directories for exercises

05_sumAll/solution/sumAll-solution.js

@@ -0,0 +1,16 @@
+const sumAll = function (min, max) {
+    if (!Number.isInteger(min) || !Number.isInteger(max)) return 'ERROR';
+    if (min < 0 || max < 0) return 'ERROR';
+    if (min > max) {
+        const temp = min;
+        min = max;
+        max = temp;
+    }
+    let sum = 0;
+    for (let i = min; i < max + 1; i++) {
+        sum += i;
+    }
+    return sum;
+};
+
+module.exports = sumAll;