Update readme with the new link to docs and branching (#21)

* Update readme with the new link to docs and branching

Part of fix for vaadin-button-flow/issues/83

* Don't mention LTS for this component

* Mention that there is no LTS support

README.md

@@ -3,6 +3,9 @@
 This project is the Component wrapper implementation of [`<vaadin-context-menu>`](https://github.com/vaadin/vaadin-context-menu) element
 for use from the server side with [Vaadin Flow](https://github.com/vaadin/flow).
 
+`master` branch is the latest version that will at some point be released in the [Vaadin platform](https://github.com/vaadin/platform). See other branches for other framework versions:
+ - `1.0` branch is Vaadin 10 (Flow/Flow-component version 1.0, but no LTS support)
+
 ## Running the component demo
 Run from the command line:
 - `mvn jetty:run -PrunTests`
@@ -25,7 +28,7 @@ add the following dependency to your `pom.xml`:
 ```
 
 ## Flow documentation
-Documentation for flow can be found in [Flow documentation](https://github.com/vaadin/flow-and-components-documentation/blob/master/Overview.asciidoc).
+Documentation for flow can be found in [Flow documentation](https://github.com/vaadin/flow-and-components-documentation/blob/master/documentation/Overview.asciidoc).
 
 ## Contributing
 - Use the coding conventions from [Flow coding conventions](https://github.com/vaadin/flow/tree/master/eclipse)