refactor; add order() fn; add examples

examples/filter.rs

@@ -0,0 +1,17 @@
+use jsonfilter::matches;
+use serde_json::json;
+
+fn main() {
+    let filter = json!({"name": "John", "age": 30});
+    let obj = json!({"name": "John", "age": 30, "city": "New York"});
+
+    println!("Applying filter:");
+    println!("{}", filter);
+    println!("To object:");
+    println!("{}", obj);
+    if matches(&filter, &obj) {
+        println!("Filter matches the object");
+    } else {
+        println!("Filter does not match the object");
+    }
+}