feat: add monkey-rs

__lang/monkey-rs/examples/sample.mky

@@ -0,0 +1,24 @@
+let s1 = "str1";
+let s2 = "str2";
+
+let s3 = s1 + " - " + s2;
+s3;
+len(s3); 
+
+
+let x = 10;
+let y = 20;
+
+let sum = fn(a, b){ a + b;};
+sum(x, y);
+
+let arr = [1, 2, 3, 4];
+sum(arr[0], arr[3]);
+
+let dict = {"one": 1, "two": 2, "three": 3};
+sum(dict["one"], dict["two"]);
+
+let fact = fn(x){ if (x > 1) { x * fact(x - 1);} else {1}};
+fact(10);
+
+exit