Add OpenDDS to Networking category in README (#1774)

* Initial plan

* Add OpenDDS to Networking section in README

Co-authored-by: fffaraz <895678+fffaraz@users.noreply.github.com>

* Refine OpenDDS README entry and license style

Co-authored-by: fffaraz <895678+fffaraz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: fffaraz <895678+fffaraz@users.noreply.github.com>

Author: Copilot

README.md

@@ -996,6 +996,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [nghttp2](https://github.com/nghttp2/nghttp2) - HTTP/2 C Library. [MIT] [website](https://nghttp2.org/)
 * [nghttp3](https://github.com/ngtcp2/nghttp3) - HTTP/3 library written in C. [MIT] [website](https://nghttp2.org/nghttp3/)
 * [Onion](https://github.com/davidmoreno/onion) - HTTP server library in C designed to be lightweight and easy to use. [Apache2/GPL2]
+* [OpenDDS](https://github.com/objectcomputing/OpenDDS) - An open source C++ implementation of the Object Management Group (OMG) Data Distribution Service (DDS). [Apache2]
 * [PF_RING™](https://github.com/ntop/PF_RING) - High-speed packet processing framework. [LGPL-2.1] [website](https://www.ntop.org/products/packet-capture/pf_ring/)
 * [PicoHTTPParser](https://github.com/h2o/picohttpparser) - A tiny, primitive, fast HTTP request/response parser. [MIT]
 * [POCO](https://github.com/pocoproject) :zap: - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems. [Boost] [website](http://pocoproject.org/)