Add solution directories for exercises

05_sumAll/solution/sumAll-solution.js

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+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;

05_sumAll/solution/sumAll-solution.spec.js

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+const sumAll = require('./sumAll-solution');
+
+describe('sumAll', () => {
+    test('sums numbers within the range', () => {
+        expect(sumAll(1, 4)).toEqual(10);
+    });
+    test.skip('works with large numbers', () => {
+        expect(sumAll(1, 4000)).toEqual(8002000);
+    });
+    test.skip('works with larger number first', () => {
+        expect(sumAll(123, 1)).toEqual(7626);
+    });
+    test.skip('returns ERROR with negative numbers', () => {
+        expect(sumAll(-10, 4)).toEqual('ERROR');
+    });
+    test.skip('returns ERROR with non-number parameters', () => {
+        expect(sumAll(10, '90')).toEqual('ERROR');
+    });
+    test.skip('returns ERROR with non-number parameters', () => {
+        expect(sumAll(10, [90, 1])).toEqual('ERROR');
+    });
+});