added palindromes exercise

palindromes/README.md

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+# Exercise XX - palindromes
+
+Write a function that determines whether or not a given string is a palindrome.
+
+A palindrome is a string that is spelled the same both forwards and backwards, usually without considering punctuation or word breaks:
+
+### some palindromes:
+  - A car, a man, a maraca.
+  - Rats live on no evil star.
+  - Lid off a daffodil.
+  - Animal loots foliated detail of stool lamina.
+  - A nut for a jar of tuna.
+  - A car, a man, a maraca.
+
+```javascript
+palindromes('racecar') // true
+palindromes('tacos') // false
+```
+
+