add example scripts for comments and loop

scripts/comments.rhai

@@ -0,0 +1,10 @@
+// I am a single line comment!
+
+let /* I am a spy in a variable declaration! */ x = 5;
+
+/* I am a simple
+   multiline comment */
+
+/* look /* at /* that, /* multiline */ comments */ can be */ nested */
+
+/* sorrounded by */ x // comments

scripts/loop.rhai

@@ -0,0 +1,8 @@
+let x = 10;
+
+// simulate do..while using loop
+loop {
+    print(x);
+    x = x - 1;
+	if x <= 0 { break; }
+}