Work towards #56: Splitting up the README

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

model-view-presenter/index.md

@@ -0,0 +1,17 @@
+---
+layout: pattern
+title: Model-View-Presenter
+folder: model-view-presenter
+categories: pattern_cat
+tags: pattern_tag
+---
+
+**Intent:** Apply a "Separation of Concerns" principle in a way that allows
+developers to build and test user interfaces.
+
+![alt text](./etc/model-view-presenter_1.png "Model-View-Presenter")
+
+**Applicability:** Use the Model-View-Presenter in any of the following
+situations
+* when you want to improve the "Separation of Concerns" principle in presentation logic
+* when a user interface development and testing is necessary.