update: readme

Author: Andrii Afanasiev

README.md

@@ -9,15 +9,46 @@ Dou to bad sync with composer there are some steps
 4. Enable extension with name ```PHPBB Code Highlight```
 5. [Optional] Navigate to the ACP ```Extensions -> PPHPBB Code Highlight -> Settings``` and setup list of languages and theme.
 
+###### NOTE
+Enabling of all languages will cause performance issues on clients side, because each langauge is loading as separate JS. 
+So, if You are still needed to have all languages, then it will be nice to have:
+1. HTTP2 on server
+2. Static-Domain
+3. CDN
+
+## How to use in posts
+To highlight code in post use new PHPBB tag [syntax]:
+```ini
+[syntax=cpp]
+#include <tuple>
+
+std::tuple<int, bool, float> foo()
+{
+	return std::make_tuple(128, true, 1.5f);
+}
+
+int main()
+{
+	std::tuple<int, bool, float> result = foo();
+	int value = std::get<0>(result);
+	int obj1;
+	bool obj2;
+	float obj3;
+	std::tie(obj1, obj2, obj3) = foo();
+}
+[/syntax]
+```
+
 ## Links
 - [PHPBB Dev Docs](https://area51.phpbb.com/docs/dev/)
 - [HighlightJS](https://highlightjs.org/)
 - [Currently Used Here](https://forum.cryengine.com/)
 - [PHPBB Events list](https://wiki.phpbb.com/Event_List)
 
-## Help needed
-1. Advise how to proper store dependency from [HighlightJS repo](https://github.com/isagalaev/highlight.js)
-2. Advise how to wrap PHPBB extension with composer
+## TODO
+1. Proper store dependency from [HighlightJS repo](https://github.com/isagalaev/highlight.js)
+2. Wrap PHPBB extension with composer
+3. Write tests
 
 ## Thank You
 Big thanks for community