doc: add README

README.md

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+# ChronoTomato
+
+A GoTomato command line client written in Go
+
+## Configuration
+
+`ChronoTomato` can be configured via CLI parameters or a config file.
+
+The configuration is loaded from `~/config/ChronoTomato.yml`, here is an example:
+```
+url: ws://localhost:8080/ws
+password: ""
+config:
+  work: 1500
+  shortbreak: 300
+  longbreak: 600
+  sessions: 4
+```
+
+The `url` must be passed either via parameter or config file.  
+The `password` and the `config` are optional, the later can only be set via the configuration file.