Add documentation assets

.gitignore

@@ -5,10 +5,7 @@ target/
 .kotlin
 
 ### IntelliJ IDEA ###
-.idea/modules.xml
+.idea
-.idea/jarRepositories.xml
-.idea/compiler.xml
-.idea/libraries/
 *.iws
 *.iml
 *.ipr
@@ -21,7 +18,7 @@ target/
 .settings
 .springBeans
 .sts4-cache
-
+.git-pre-*
 ### NetBeans ###
 /nbproject/private/
 /nbbuild/