Global and Domain Concurrency limit implemented. Updated README

README.md

@@ -1,5 +1,5 @@
 # Geziyor
-Geziyor is a fast web crawling and web scraping framework, used to crawl websites and extract structured data from their pages. It can be used for a wide range of purposes, from data mining to monitoring and automated testing.   
+Geziyor is a blazing fast web crawling and web scraping framework, used to crawl websites and extract structured data from their pages. It can be used for a wide range of purposes, from data mining to monitoring and automated testing.   
 
 [![GoDoc](https://godoc.org/github.com/geziyor/geziyor?status.svg)](https://godoc.org/github.com/geziyor/geziyor)
 [![report card](https://goreportcard.com/badge/github.com/geziyor/geziyor)](http://goreportcard.com/report/geziyor/geziyor)
@@ -8,9 +8,24 @@ Geziyor is a fast web crawling and web scraping framework, used to crawl website
 - 1.000+ Requests/Sec
 - Caching
 - Automatic Data Exporting
+- Limit Concurrency Global/Per Domain
+- Automatic response decoding to UTF-8
 
 
-## Example
+## Usage
+Simplest usage 
+
+```go
+geziyor.NewGeziyor(geziyor.Options{
+    StartURLs: []string{"http://api.ipify.org"},
+    ParseFunc: func(r *geziyor.Response) {
+    	fmt.Println(r.Doc.Text())
+    },
+}).Start()
+```
+
+Export all quotes and authors to out.json file.
+
 ```go
 geziyor := NewGeziyor(Opt{
     StartURLs: []string{"http://quotes.toscrape.com/"},