Update README.md

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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -3,4 +3,71 @@ Crow
 
 Crow is C++ microframework for web. (inspired by Python Flask)
 
+(still in development, not completed yet)
 
+Example
+=======
+
+```c++
+
+#include "crow.h"
+#include "json.h"
+
+#include <sstream>
+
+int main()
+{
+    crow::Crow app;
+
+    CROW_ROUTE(app, "/")
+        .name("hello")
+    ([]{
+        return "Hello World!";
+    });
+
+    CROW_ROUTE(app, "/about")
+    ([](){
+        return "About Crow example.";
+    });
+
+    // simple json response
+    CROW_ROUTE(app, "/json")
+    ([]{
+        crow::json::wvalue x;
+        x["message"] = "Hello, World!";
+        return x;
+    });
+
+    CROW_ROUTE(app,"/hello/<int>")
+    ([](int count){
+        if (count > 100)
+            return crow::response(400);
+        std::ostringstream os;
+        os << count << " bottles of beer!";
+        return crow::response(os.str());
+    });
+
+    // Compile error with message "Handler type is mismatched with URL paramters"
+    //CROW_ROUTE(app,"/another/<int>")
+    //([](int a, int b){
+        //return crow::response(500);
+    //});
+
+    // more json example
+    CROW_ROUTE(app, "/add_json")
+    ([](const crow::request& req){
+        auto x = crow::json::load(req.body);
+        if (!x)
+            return crow::response(400);
+        int sum = x["a"].i()+x["b"].i();
+        std::ostringstream os;
+        os << sum;
+        return crow::response{os.str()};
+    });
+
+    app.port(18080)
+        .multithreaded()
+        .run();
+}
+
+```