Add documentation converted from old Trac wiki pages

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

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+LuCI has a simple regex based template processor which parses HTML-files to Lua functions and allows to store precompiled template files.
+The simplest form of a template is just an ordinary HTML-file. It will be printed out to the user as is.
+
+In LuCI every template is an object with an own scope. It can therefore be instanciated and each instance can has a different scope. As every template processor. LuCI supports several special markups. Those are enclosed in *<% %>-Tags*.
+
+By adding a *-_' right after the opening '''<%''' every whitespace before the markup will be stripped. Adding a '''-''' right before the closing '_%>* will equivalently strip every whitespace behind the markup.
+
+<<BR>>
+
+
+# Builtin functions and markups
+## Including Lua code
+*Markup:*
+	
+	<% code %>
+	
+
+
+## Writing variables and function values
+*Syntax:*
+	
+	<% write (value) %>
+	
+
+*Short-Markup:*
+	
+	<%=value%>
+	
+
+## Including templates
+*Syntax:*
+	
+	<% include (templatename) %>
+	
+
+*Short-Markup:*
+	
+	<%+templatename%>
+	
+
+
+## Translating
+*Syntax:*
+	
+	<%= translate("Text to translate") %>
+	
+
+
+*Short-Markup:*
+	
+	<%:Text to translate%>
+	
+
+
+## Commenting
+*Markup:*
+	
+	<%# comment %>
+	
+
+# Builtin constants
+||*Name_'||'_Value*||
+||REQUEST_URI||The current URL (without server part)||
+||controller||Path to the Luci main dispatcher||
+||resource||Path to the resource directory||
+||media||Path to the active theme directory||