Implement a functionality to add an entry to the user dictionary

java/res/drawable-hdpi/ic_menu_add.png

java/res/drawable-mdpi/ic_menu_add.png

java/res/drawable-xhdpi/ic_menu_add.png

java/res/layout/user_dictionary_add_word.xml

java/res/layout/user_dictionary_add_word_fullscreen.xml

java/res/layout/user_dictionary_item.xml

java/res/layout/user_dictionary_preference_list_fragment.xml

java/res/values/dimens.xml

java/res/values/strings.xml

java/src/com/android/inputmethod/latin/SettingsFragment.java

...d/latin/userdictionary/UserDictionaryAddWordContents.java

...d/latin/userdictionary/UserDictionaryAddWordFragment.java

.../inputmethod/latin/userdictionary/UserDictionaryList.java

...thod/latin/userdictionary/UserDictionaryLocalePicker.java

...utmethod/latin/userdictionary/UserDictionarySettings.java