Work towards #56: Splitting up the README

I did the job and splitted up the readme, hopefully everything was
splitted correctly...

chain-of-responsibility/index.md

@@ -0,0 +1,24 @@
+---
+layout: pattern
+title: Chain of responsibility
+folder: chain-of-responsibility
+categories: pattern_cat
+tags: pattern_tag
+---
+
+**Intent:** Avoid coupling the sender of a request to its receiver by giving
+more than one object a chance to handle the request. Chain the receiving
+objects and pass the request along the chain until an object handles it.
+
+![alt text](./chain/etc/chain_1.png "Chain of Responsibility")
+
+**Applicability:** Use Chain of Responsibility when
+
+* more than one object may handle a request, and the handler isn't known a priori. The handler should be ascertained automatically
+* you want to issue a request to one of several objects without specifying the receiver explicitly
+* the set of objects that can handle a request should be specified dynamically
+
+**Real world examples:**
+
+* [java.util.logging.Logger#log()](http://docs.oracle.com/javase/8/docs/api/java/util/logging/Logger.html#log%28java.util.logging.Level,%20java.lang.String%29)
+* [Apache Commons Chain](https://commons.apache.org/proper/commons-chain/index.html)