Initial data commit

Task/Set/Nanoquery/set-2.nanoquery

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+import "rosetta-code/set.nq"
+
+a = new(set, {1, 2, 3, 4, 5})
+b = new(set, {2, 3, 4, 5, 6, 8})
+c = new(set, {2, 3, 4})
+d = new(set, {2, 3, 4})
+
+println "a: " + a
+println "b: " + b
+println "c: " + c
+println "d: " + d
+
+println "2 in a: " + a.contains(2)
+println "6 in a: " + a.contains(6)
+
+println "a union b: "        + a.union(b)
+println "a - b: "            + a.difference(b)
+println "c subset of a: "    + c.subset(a)
+
+println "c = d: "            + (c = d)
+println "d = c: "            + (d = c)
+
+println "a intersect b: "    + a.intersection(b)
+println "add 7 to a: "       + a.append(7)
+println "add 2 to a again: " + a.append(2)