delete redundant files/requirements in Javascript folder

js/.gitignore

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-*.swp
-*~
-*.bak

js/README.md

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-If you want to get cracking on the JavaScript source then do this:
-
-    git clone git@github.com:guyroyse/gilded-rose-javascript.git
-
-Hi and welcome to team Gilded Rose.
-
-As you know, we are a small inn with a prime location in a prominent city ran
-by a friendly innkeeper named Allison.  We also buy and sell only the finest
-goods. Unfortunately, our goods are constantly degrading in quality as they
-approach their sell by date.
-
-We have a system in place that updates our inventory for us. It was developed
-by a no-nonsense type named Leeroy, who has moved on to new adventures. Your
-task is to add the new feature to our system so that we can begin selling a
-new category of items.
-
-First an introduction to our system:
-
-  - All items have a *sell_in* value which denotes the number of days we have to
-    sell the item
-
-  - All items have a *quality* value which denotes how valuable the item is
-
-  - At the end of each day our system lowers both values for every item
-
-Pretty simple, right? Well this is where it gets interesting:
-
-  - Once the *sell_in* days is less then zero, *quality* degrades twice as fast
-
-  - The *quality* of an item is never negative
-
-  - "Aged Brie" actually increases in *quality* the older it gets
-
-  - The *quality* of an item is never more than 50
-
-  - "Sulfuras", being a legendary item, never has to be sold nor does it
-    decrease in *quality*
-
-  - "Backstage passes", like aged brie, increases in *quality* as it's *sell_in*
-    value decreases; *quality* increases by 2 when there are 10 days or less
-    and by 3 when there are 5 days or less but *quality* drops to 0 after the
-    concert
-
-We have recently signed a supplier of conjured items. This requires an update
-to our system:
-
-  - "Conjured" items degrade in *quality* twice as fast as normal items
-
-Feel free to make any changes to the *update_quality* method and add any new
-code as long as everything still works correctly. However, do not alter the
-*Item* class or *items* property as those belong to the goblin in the corner
-who will insta-rage and one-shot you as he doesn't believe in shared code
-ownership.
-
-Just for clarification, an item can never have its *quality* increase above 50,
-however "Sulfuras" is a legendary item and as such its *quality* is 80 and it
-never alters.
-
-Sources:
-  <http://www.iamnotmyself.com/2011/02/13/RefactorThisTheGildedRoseKata.aspx>
-  <https://github.com/professor/GildedRose>