add: README.md 추가

README.md

@@ -0,0 +1,29 @@
+# Jin Web Framework
+
+Jin is a web framework written in Java. It features a coffee-like API with performance that is up to 1x faster. If you need fun and enjoy, you will love Jin.
+
+## How to Use
+
+### build.gradle
+``` groovy
+implementation 'com.kimhyun5u.jin:jin:1.0.0'
+```
+
+### main.java
+``` java
+import http.Server;
+
+public class Main {
+    public static void main(String[] args) {
+
+        Server server = Server.defaultServer(8080, 10);
+
+        server.get("/", (ctx) -> {
+                    ctx.response().setBody("Hello, World!".getBytes());
+                }
+        );
+
+        server.start();
+    }
+}
+```