readme update: routeing with conditions

README.md

@@ -55,6 +55,33 @@ matched_node->endpoint; // make sure there is a route end at here.
 int ret = *( (*int) matched_node->route_ptr );
 ```
 
+### Routing with conditions
+
+```c
+// create a router tree with 10 children capacity (this capacity can grow dynamically)
+n = r3_tree_create(10);
+
+int route_data = 3;
+
+match_entry * entry = match_entry_create("/foo/bar");
+
+// insert the route path into the router tree
+route *r1 = route_create("/blog/post");
+r1->request_method = METHOD_GET | METHOD_POST; // ALLOW GET OR POST
+
+r3_tree_insert_route(n, r1, NULL, &route_data );
+
+r3_tree_compile(n);
+
+node *matched_node = r3_tree_match(n, "/foo/bar", strlen("/foo/bar"), entry);
+matched_node->endpoint; // make sure there is a route end at here.
+
+if (matched_node->routes) {
+    route *c = r3_node_match_route(m, entry);
+    c->data; // get the data from matched route
+}
+```
+
 
 
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