Add tasks for all the new languages

Task/Even-or-odd/Crystal/even-or-odd.crystal

@@ -0,0 +1,30 @@
+#Using bitwise shift
+  def isEven_bShift(n)
+    n == ((n >> 1) << 1)
+  end
+  def isOdd_bShift(n)
+    n != ((n >> 1) << 1)
+  end
+#Using modulo operator
+  def isEven_mod(n)
+    (n % 2) == 0
+  end
+  def isOdd_mod(n)
+    (n % 2) != 0
+  end
+# Using bitwise "and"
+  def isEven_bAnd(n)
+    (n & 1) ==  0
+  end
+  def isOdd_bAnd(n)
+    (n & 1) != 0
+  end
+
+puts isEven_bShift(7)
+puts isOdd_bShift(7)
+
+puts isEven_mod(12)
+puts isOdd_mod(12)
+
+puts isEven_bAnd(21)
+puts isOdd_bAnd(21)