Update README.md

README.md

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 # TinyMqtt
-ESP 8266 Small footprint Mqtt Broker and Client
+ESP 8266 is a very capable Mqtt Broker and Client
+
+Here are the features
+- mqtt client can Works without WiFi (local mode) in a unique ESP
+  Thus, publishes and subscribes are possible and allows
+  minimal (degraded) function of a single module.
+- broker can connect to another broker and becomes then a
+  proxy for clients that are connected to it.
+- zeroconf, this is a strange but very powerful mode
+  where each ESP is a a broker and scans the local network.
+  After a while one ESP becomes the 'master'
+  and all ESP are connected together. The master can die
+  whithout breaking the system.