Work towards #56: Splitting up the README

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

introduction/index.md

@@ -0,0 +1,18 @@
+---
+layout: pattern
+title: Introduction
+folder: introduction
+categories: pattern_cat
+tags: pattern_tag
+---
+
+
+Design patterns are formalized best practices that the programmer can use to
+solve common problems when designing an application or system.
+
+Design patterns can speed up the development process by providing tested, proven
+development paradigms.
+
+Reusing design patterns helps to prevent subtle issues that can cause major
+problems, and it also improves code readability for coders and architects who
+are familiar with the patterns.