feat: implement describeMedian function to calculate and return the median

Author: MattCarolus10

Sprint-1/implement/describe-median.js

@@ -20,6 +20,13 @@ function calculateMedian(list) {
 }
 
 // Implement this function. See describe-median.test.js for the acceptance criteria.
-function describeMedian(list) {}
+function describeMedian(list) {
+  try {
+    const median = calculateMedian(list);
+    return "The median is " + median;
+  } catch (error) {
+    return "Could not calculate a median: " + error.message;
+  }
+}
 
 module.exports = describeMedian;