Add solution directories for exercises

06_leapYears/solution/leapYears-solution.js

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+const leapYears = function (year) {
+    return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
+};
+
+module.exports = leapYears;

06_leapYears/solution/leapYears-solution.spec.js

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+const leapYears = require('./leapYears-solution');
+
+describe('leapYears', () => {
+    test('works with non century years', () => {
+        expect(leapYears(1996)).toBe(true);
+    });
+    test.skip('works with non century years', () => {
+        expect(leapYears(1997)).toBe(false);
+    });
+    test.skip('works with ridiculously futuristic non century years', () => {
+        expect(leapYears(34992)).toBe(true);
+    });
+    test.skip('works with century years', () => {
+        expect(leapYears(1900)).toBe(false);
+    });
+    test.skip('works with century years', () => {
+        expect(leapYears(1600)).toBe(true);
+    });
+    test.skip('works with century years', () => {
+        expect(leapYears(700)).toBe(false);
+    });
+});