Add solution directories for exercises

07_tempConversion/solution/tempConversion-solution.js

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+const ftoc = function (f) {
+    return Math.round((f - 32) * (5 / 9) * 10) / 10;
+};
+
+const ctof = function (c) {
+    return Math.round(((c * 9) / 5 + 32) * 10) / 10;
+};
+
+module.exports = {
+    ftoc,
+    ctof,
+};

07_tempConversion/solution/tempConversion-solution.spec.js

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+const { ftoc, ctof } = require('./tempConversion-solution');
+
+describe('ftoc', () => {
+    test('works', () => {
+        expect(ftoc(32)).toEqual(0);
+    });
+    test.skip('rounds to 1 decimal', () => {
+        expect(ftoc(100)).toEqual(37.8);
+    });
+    test.skip('works with negatives', () => {
+        expect(ftoc(-100)).toEqual(-73.3);
+    });
+});
+
+describe('ctof', () => {
+    test.skip('works', () => {
+        expect(ctof(0)).toEqual(32);
+    });
+    test.skip('rounds to 1 decimal', () => {
+        expect(ctof(73.2)).toEqual(163.8);
+    });
+    test.skip('works with negatives', () => {
+        expect(ctof(-10)).toEqual(14);
+    });
+});