README changes

README.md

@@ -1,2 +1,15 @@
-# project_euler_crawler
-Simple crawler based on a scrapy for Project Euler
+# Project Euler Crawler
+It is a very simple crawler for [Project Euler](https://projecteuler.net). It collects only conditions of problems and their numbers.
+
+Crawled data stored in `output` dir.
+
+## Dependencies
+Requires only [scrapy](http://scrapy.org/).
+
+## Using
+If you want recrawl data you need type:
+
+    scrapy crawl euler -o PATH_TO_FILE.csv
+or 
+
+    scrapy crawl euler -o PATH_TO_FILE.xml