Added DataMapper UML

Structural/DataMapper/uml/uml.svg

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" height="96pt" style="width:197px;height:96px;background:#000000;" version="1.1" viewBox="0 0 197 96" width="197pt"><defs/><g><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="164" x="0" y="13.5352">... (skipping 20 lines) ...</text><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="176" x="20" y="30.0234">+mapObject(array $row)</text><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="5" x="0" y="46.5117">}</text><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="0" x="5" y="63"/><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="32" x="0" y="79.4883">User</text><text fill="#33FF02" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="0" x="5" y="95.9766"/><text fill="#FF0000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="94" x="5" y="95.9766">Syntax Error?</text></g></svg>

Structural/DataMapper/uml/uml.txt

@@ -0,0 +1,26 @@
+@startuml
+class User {
+    protected $userId
+    protected $username
+    protected $email
+    +__construct($id = null, $username = null, $email = null)
+    +getUserId()
+    +setUserID($userId)
+    +getUsername()
+    +setUsername($username)
+    +getEmail()
+    +setEmail($email)
+}
+
+class UserMapper {
+    protected $adapter
+    +__construct(DBAL $dbLayer)
+    +save(User $user)
+    +findById($id)
+    +findAll()
+    +mapObject(array $row)
+}
+
+User
+UserMapper
+@enduml