Cleanup (#19)

* reformatting of skill checks table

* Including own Random "generator", more refactoring

__tests__/functions/CalculateQuality.js

@@ -0,0 +1,12 @@
+const {CalculateQuality} = require('@dsabot/CalculateQuality');
+
+const TestValues = [
+    [1,1], [2,1], [3,1],
+    [4,2], [5,2], [6,2],
+    [7,3], [8,3], [9,3],
+    [10,4],[11,4],[12,4],
+    [13,5],[14,5],[15,5]
+];
+test.each(TestValues)('Retrieving Quality for %s', (input, output) => {
+    expect(CalculateQuality(input)).toBe(output);
+  });