docs: add Rpcx description (#2552)

* docs: add Rpcx description

* Update 101-rpcx.md

* Update 101-rpcx.md

content/roadmaps/109-golang/content/109-go-microservices/101-rpcx.md

@@ -1 +1,12 @@
 # Rpcx
+
+Rpcx is a RPC (Remote Procedure Call) framework like Alibaba Dubbo and Weibo Motan. Some of the advantages on using Rpcx:
+- Simple: easy to learn, easy to develop, easy to intergate and easy to deploy
+- Performance: high performance (>= grpc-go)
+- Cross-platform: support raw slice of bytes, JSON, Protobuf and MessagePack. Theoretically it can be used with java, php, python, c/c++, node.js, c# and other platforms
+- Service discovery and service governance: support zookeeper, etcd and consul.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://en.doc.rpcx.io/'>Rpcx English Documentation</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Github' href='https://github.com/smallnest/rpcx'>Rpcx Github</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://rpcx.io/'>Rpcx Official Website</BadgeLink>