Add spec text file as blueprint for tests

texttest/specs.txt

@@ -0,0 +1,20 @@
+SPECS
+    LOGIC
+        - sellIn decreases every day
+        - Item.quality
+            - is >= 0 && <= 50
+            - decreses until sellIn is <= 0
+            - when sellIn == 0 quality degrades twice as fast
+        - Sulfuras
+            sellIn = 0 // doesnt change
+            quality is 80 and does not decrease
+        - AgedBrie increases in quality
+        - BackstagePasses
+            increases in quality like AgedBrie
+                sellIn <= 0 - quality = 0
+                sellIn <= 5 -> increment by 3
+                sellIn <= 10 -> increment by 2
+
+    TODO
+        - add support Conjured items
+            degrade in quality twice as fast as normal items