Add solution directories for exercises

10_fibonacci/solution/fibonacci-solution.js

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+const fibonacci = function (count) {
+    if (count < 0) return 'OOPS';
+    if (count === 0) return 0;
+    let a = 0;
+    let b = 1;
+    for (let i = 1; i < count; i++) {
+        const temp = b;
+        b = a + b;
+        a = temp;
+    }
+    return b;
+};
+
+module.exports = fibonacci;

10_fibonacci/solution/fibonacci-solution.spec.js

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+const fibonacci = require('./fibonacci-solution');
+
+describe('fibonacci', () => {
+    test('4th fibonacci number is 3', () => {
+        expect(fibonacci(4)).toBe(3);
+    });
+    test.skip('6th fibonacci number is 8', () => {
+        expect(fibonacci(6)).toBe(8);
+    });
+    test.skip('10th fibonacci number is 55', () => {
+        expect(fibonacci(10)).toBe(55);
+    });
+    test.skip('15th fibonacci number is 610', () => {
+        expect(fibonacci(15)).toBe(610);
+    });
+    test.skip('25th fibonacci number is 75025', () => {
+        expect(fibonacci(25)).toBe(75025);
+    });
+    test.skip("doesn't accept negatives", () => {
+        expect(fibonacci(-25)).toBe('OOPS');
+    });
+    test.skip('DOES accept strings', () => {
+        expect(fibonacci('1')).toBe(1);
+    });
+    test.skip('DOES accept strings', () => {
+        expect(fibonacci('2')).toBe(1);
+    });
+    test.skip('DOES accept strings', () => {
+        expect(fibonacci('8')).toBe(21);
+    });
+});