Initial data commit

Task/Factorial/Ecstasy/factorial.ecstasy

@@ -0,0 +1,18 @@
+module ShowFactorials {
+    static <Value extends IntNumber> Value factorial(Value n) {
+        assert:arg n >= Value.zero();
+        return n <= Value.one() ? n : n * factorial(n-Value.one());
+    }
+
+    @Inject Console console;
+    void run() {
+        // 128-bit test
+        UInt128 bigNum = 34;
+        console.print($"factorial({bigNum})={factorial(bigNum)}");
+
+        // 64-bit test
+        for (Int i : 10..-1) {
+            console.print($"factorial({i})={factorial(i)}");
+        }
+    }
+}