add solution with fixed indentation

1-js/05-data-types/08-keys-values-entries/01-sum-salaries/solution.md

@@ -0,0 +1,14 @@
+```js run
+function sumSalaries(salaries) {
+
+  let sum = 0;
+  for (let salary of Object.values(salaries)) {
+    sum += salary;
+  }
+
+  return sum; // 650
+}
+```
+Or, optionally, we could also get the sum using `Object.values` and `reduce`:
+
+`Object.values(salaries).reduce((a, b) => a + b) // 650`