unit test added

test/unittest/float_literals.gravity

@@ -0,0 +1,20 @@
+#unittest {
+    name: "Float complex literals";
+    result: "[21.120120,12.200100,0.122120,0.000000]";
+};
+
+func main() {
+    var data = [
+        [
+            "a": [10.12, 10.12121, 0.01012, 0.021],
+            "b": [1.0101, 0.12021, 0.1021, 0.0 ],
+            "c": [0.012012, -0.0101, -0.011, 0.01],
+            "d": [102.12, 1.12, 0.011, 0.012]],
+        [
+            "a": [21.12012, 12.2001, 0.12212, 0.0],
+            "b": [1.1121, -0.012, 0.12022, 0.0],
+            "c": [0.12210, 0.012, 0.12022, 0.0],
+            "d": [21.0, -0.0101212, 0.12022, 0.0]]]
+    
+    return String(data[1].a);
+}