Add tasks for all the new languages

Task/Arrays/Ring/arrays.ring

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+# create an array with one string in it
+a = ['foo']
+
+# add items
+a + 1         # ["foo", 1]
+
+# set the value at a specific index in the array
+a[1] = 2       # [2, 1]
+
+# retrieve an element
+see a[1]