docs: add Spanish README

README.es-ES.md

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+# GoLookup
+
+Un cliente y servidor DNS implementado en Go.
+
+Soporta los tipos de registros `A`, `MX`, `CNAME`, `TXT` y `NS`.
+
+Cumple con el [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035).
+
+## Arquitectura
+
+```mermaid
+graph TD
+    A[CLI Input] -->|Client Mode| E[Generate New DNS Query]
+    C[External DNS Client e.g. dig] --> D[UDP Listener :port]
+
+    D -->|Server Mode| F[Parse Incoming Query]
+    F -->|Get Domain and Type| E
+
+    E -->|Root Server 198.41.0.4| I[Send DNS Query]
+    I --> J[Parse Response Packet]
+    J --> K{Answer Found?}
+
+    K -->|Yes| V[Display Result to CLI]
+    V -->|Server Mode| W[Send Response to Client]
+
+    K -->|No| L[Extract TLD/Authortative <br>Name Server domain]
+    L --> M{Its IP Found?}
+    M -->|Yes| I
+    M -->|No| E
+
+    style A fill:#e1f5fe
+    style C fill:#e1f5fe
+    style I fill:#fff3e0
+    style V fill:#e8f5e8
+    style W fill:#e8f5e8
+```
+
+## Ejemplo de Uso
+
+```
+$ go run ./cmd -h
+usage:
+    golookup [domain] [A|NS|MX|CNAME|TXT]
+    golookup serve --port=<port-number>
+```
+
+```
+$ go run ./cmd serve --port=9999 &
+[1] 25685
+$ dig @127.0.0.1 -p 9999 example.com NS
+
+Querying: 198.41.0.4
+Received Name Server for "com": "l.gtld-servers.net"
+Received "l.gtld-servers.net" IP: "192.41.162.30"
+Querying: 192.41.162.30
+Received Name Server for "example.com": "b.iana-servers.net"
+name server IP not found in packet
+starting new query for: b.iana-servers.net
+Querying: 198.41.0.4
+Received Name Server for "net": "m.gtld-servers.net"
+Received "m.gtld-servers.net" IP: "192.55.83.30"
+Querying: 192.55.83.30
+Received Name Server for "iana-servers.net": "a.iana-servers.net"
+Received "a.iana-servers.net" IP: "199.43.135.53"
+Querying: 199.43.135.53
+new query done, found "b.iana-servers.net" IP: "199.43.133.53"
+Querying: 199.43.133.53
+
+; <<>> DiG 9.18.30-0ubuntu0.24.04.2-Ubuntu <<>> @127.0.0.1 -p 9999 example.com ns
+; (1 server found)
+;; global options: +cmd
+;; Got answer:
+;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55664
+;; flags: qr; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
+
+;; QUESTION SECTION:
+;example.com.                   IN      NS
+
+;; ANSWER SECTION:
+example.com.            86400   IN      NS      a.iana-servers.net.
+example.com.            86400   IN      NS      b.iana-servers.net.
+
+;; Query time: 909 msec
+;; SERVER: 127.0.0.1#9999(127.0.0.1) (UDP)
+;; WHEN: Fri Sep 12 15:57:06 EEST 2025
+;; MSG SIZE  rcvd: 115
+```
+
+## TODO
+
+- [ ] Agregar soporte para consultas inversas.
+- [ ] Mejorar el manejo de errores.
+- [ ] Soporte para registros `TXT` en modo servidor.