Work towards #56: Splitting up the README

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

lazy-loading/index.md

@@ -0,0 +1,22 @@
+---
+layout: pattern
+title: Lazy Loading
+folder: lazy-loading
+categories: pattern_cat
+tags: pattern_tag
+---
+
+**Intent:** Lazy loading is a design pattern commonly used to defer
+initialization of an object until the point at which it is needed. It can
+contribute to efficiency in the program's operation if properly and
+appropriately used.
+
+![alt text](./etc/lazy-loading.png "Lazy Loading")
+
+**Applicability:** Use the Lazy Loading idiom when
+
+* eager loading is expensive or the object to be loaded might not be needed at all
+
+**Real world examples:**
+
+* JPA annotations @OneToOne, @OneToMany, @ManyToOne, @ManyToMany and fetch = FetchType.LAZY