update readme

README.md

@@ -1,2 +1,31 @@
 # zerve
 A simple framework for writing web services in zig.
+
+## Create a simple web app
+
+```zig
+usingnamespace @import("zerve");
+const allocator = std.heap.page_allocator;
+
+fn index(req: Request) Response {
+    _=req;
+    return Response.new("hello!");
+}
+
+fn about(req: Request) Response {
+    _=req;
+    return Response.new("about site");
+}
+
+fn writeJson(req: Request) Response {
+    _=req;
+    Response.json("[1, 2, 3, 4]");
+}
+
+pub fn main() !void {
+     const rt = [_]Route{.{"/", index}, .{"/about", about}, .{"/json", writeJson}};
+
+     try Server.listen("0.0.0.0", 8080, &rt, allocator);
+}
+
+```