refactor; add order() fn; add examples

examples/comparison.rs

@@ -0,0 +1,16 @@
+use jsonfilter::order;
+use serde_json::json;
+use std::cmp::Ordering;
+
+fn main() {
+    let a = json!(10);
+    let b = json!(5);
+    println!("Comparing JSON values:");
+    println!("a: {}", a);
+    println!("b: {}", b);
+    match order(&a, &b) {
+        Ordering::Greater => println!("a is greater than b"),
+        Ordering::Less => println!("a is less than b"),
+        Ordering::Equal => println!("a is equal to b"),
+    }
+}