Add employee report kata.

content/kata/Employee-Report.md

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+---
+title: "Employee Report"
+draft: false
+date: "2019-06-15T00:00:00"
+aliases:
+  - "/Employee-Report"
+
+---
+**About this Kata**
+
+This Kata was developed to show how overspecification of assertions harms maintainability of tests. 
+A blog post with a possible solution can be found here: https://dev.to/webpapaya/writing-better-test-assertions-lml
+
+**Problem Description**
+You're building an employee management system of a local grocery store. The shop-owner wants to open the shop on Sunday and due to legal restrictions employees younger than 18 years are not allowed to work Sundays. The employee asks for a reporting feature so she can schedule work shifts. All employees are already stored somewhere and have the following properties:
+
+- name: string (the name of the employee)
+- age: number (the age in years of the employee)
+
+```js 
+const employees = [
+  { name: 'Max', age: 17 },
+  { name: 'Sepp', age: 18 },
+  { name: 'Nina', age: 15 },
+  { name: 'Mike', age: 51 },
+];
+```
+
+**Rules**
+Start with the first user-story and write at least one test for every requirement. Try not to look on future requirements upfront and follow the TDD-Cycle strictly.
+
+- As shop owner I want to view a list of all employees, which are older than 18 years, so that I know who is allowed to work on Sundays.
+- As shop owner I want the list of employees to be sorted by their name, so I can find employees easier.
+- As shop owner I want the list of employees to be capitalized, so I can read it better.
+- As shop owner I want the employees to be sorted by their names descending instead of ascending.