Added EthereumJS footer with organization docs linking

Author: holgerd77

README.md

@@ -129,6 +129,12 @@ The following settings are favoured by the Go Ethereum implementation and we def
 - `p`: `1`
 - `cipher`: `aes-128-ctr`
 
+# EthereumJS
+
+See our organizational [documentation](https://ethereumjs.readthedocs.io) for an introduction to `EthereumJS` as well as information on current standards and best practices.
+
+If you want to join for work or do improvements on the libraries have a look at our [contribution guidelines](https://ethereumjs.readthedocs.io/en/latest/contributing.html).
+
 ## License
 
 MIT License