Created strings.xml for nb

Proposed for getting the keyboard name into norwegian language.

See this issue for the reason to choose the 'nb' language code: AnySoftKeyboard/AnySoftKeyboard#1307

Author: FTno

src/main/res/values-nb/strings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">AnySoftKeyboard - Norwegian Language Pack</string>
+    <string name="keyboard_name">Norsk</string>
+    <string name="dictionary_name">Norsk</string>
+</resources>