obsolete template syntax and update get_markup_template() documentation

Quick-Template-Guide.md

@@ -1,9 +1,11 @@
 friendica  has a template system. We are trying to separate html from php (wich is also a good think if we want a mobile teme).
 This template system allows variables substitution, a minimal logic and possibility to include a template in another template.
-In 'view' folder there are some template for form fields, ready to be included, so that every form looks the same throughout the site.
+In 'view/templates' folder there are some template for form fields, ready to be included, so that every form looks the same throughout the site.
 
 #A quick guide#
-##1 - template syntax.###
+##1 - template syntax. OBSOLETE###
+
+**Friendica default template engine is now Smarty3. Refer to smarty3 documentation**
 
 ###Variables###
 
@@ -81,12 +83,17 @@ example:
 
 In friendica, templates are used with two functions:
 
-    get_markup_template($templatename);
+    get_markup_template($templatename, [$root]);
     replace_macro($tpl, $array);
 
-The first function search _$templatename_ in _view/theme/$currenttheme_ and _view/_ and return its content.
+_get_markup_template()_ search _$templatename_ in _$root/theme/templates/$currenttheme_ and _$root/templates_ and return its content. If _$root_ is not defined, defaults to _view/_ 
 
-The second replace _$array_ in template content.
+Addons can load custom templates saving template files in _templates/_ subfolder, and calling _get_markup_template()_ with plugin relative path as _$root_:
+
+    $tpl = get_markup_template("mytemplate.tpl", "addon/myplugin/");
+
+
+_replace_macro()_ replace _$array_ in template content.
 
     file: test.tpl
     Hello $name! {{ if $isback }} Welcome back! {{ endif }}
@@ -105,7 +112,7 @@ result:
 
 ##Form fields templates##
 
-In view/ folder there are many template for form fields.
+In view/template folder there are many template for form fields.
 
 - **field_input.tpl**: prints a text input
 - **field_password.tpl**: prints a password input
@@ -143,7 +150,4 @@ The $field var is an array:
  - field_select_raw: prebuild html string of < option > tags
  - field_yesno: custom labels for OFF and ON in array ("label off","label on"
 
-A trick in addons to load a template from addon folder:
 
-    in addon/myaddon/myaddon.php
-    $tpl = file_get_content(dirname(__file__)."/mytemplate.tpl";