docs: update README.md

README.md

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 # RuleRx
-The reactive RuleEngine library
+A library for rule evaluation written in Typescript that enables the reactive 
+approach (with Rx.js) on business objects.
+
+## The reactive RuleEngine library
+
+The engine allow evaluating rules that are defined as object streams representing a 
+scenario.
+Rules configuration leverage JsonPath specification in order to allow traversing objects
+nodes without requiring a predefined schema.
+
+No predefined schema does not mean you can't have type-safety!  you can set the type
+of any given context on which the rules will be evaluated.
+
+Rules are evaluated among observables of the business context which produces an 
+observable stream of emitted results whenever there's a match.
+
+Context observables can emit new values over time, and the rules will be streamed any
+time your business context changes.
+
+
+