feat: initial implementation of go-kite

Core framework:
- Kite router with full HTTP method support (GET, POST, PUT, DELETE, HEAD, OPTIONS, CONNECT, TRACE)
- Nestable route groups with prefix and middleware inheritance
- Global, group, and route-level middleware with onion ordering
- Centralized error, not-found, and method-not-allowed handlers
- Graceful shutdown on SIGTERM/SIGINT with configurable timeout
- Configurable server read, write, and idle timeouts
- Context with typed request/response helpers, value store, cookie, form, and body binding support
- Response writer wrapper for status code tracking

Middleware:
- Logger with configurable output, format, and skip function
- Recovery with configurable panic handler
- RequestID with configurable header and generator, forwards incoming IDs
- CORS with configurable origins, methods, headers, credentials, and max age
- MaxBodySize with configurable byte limit

Docs:
- README with quickstart, routing, middleware, context API reference, and TLS guide

response_writer.go

@@ -0,0 +1,33 @@
+package kite
+
+import "net/http"
+
+type responseWriter struct {
+	http.ResponseWriter
+	statusCode int
+	written    bool
+}
+
+func newResponseWriter(w http.ResponseWriter) *responseWriter {
+	return &responseWriter{
+		ResponseWriter: w,
+		statusCode:     http.StatusOK,
+	}
+}
+
+func (rw *responseWriter) WriteHeader(statusCode int) {
+	if rw.written {
+		return
+	}
+
+	rw.statusCode = statusCode
+	rw.written = true
+	rw.ResponseWriter.WriteHeader(statusCode)
+}
+
+func (rw *responseWriter) Write(b []byte) (int, error) {
+	if !rw.written {
+		rw.WriteHeader(http.StatusOK)
+	}
+	return rw.ResponseWriter.Write(b)
+}