Work towards #56: Splitting up the README

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

tolerant-reader/index.md

@@ -0,0 +1,18 @@
+---
+layout: pattern
+title: Tolerant Reader
+folder: tolerant-reader
+categories: pattern_cat
+tags: pattern_tag
+---
+
+**Intent:** Tolerant Reader is an integration pattern that helps creating
+robust communication systems. The idea is to be as tolerant as possible when
+reading data from another service. This way, when the communication schema
+changes, the readers must not break.
+
+![alt text](./etc/tolerant-reader.png "Tolerant Reader")
+
+**Applicability:** Use the Tolerant Reader pattern when
+
+* the communication schema can evolve and change and yet the receiving side should not break