feat: impl requests handllers for contacts and healthcheck

internal/handler/health_handler.go

@@ -0,0 +1,16 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func HandlHealthChecks(mux *http.ServeMux) {
+	routes := []Route{{"GET /health", healthCheck}}
+	NewBaseHandler(mux, routes)
+}
+
+func healthCheck(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
+}