updated readme

README.md

@@ -1 +1,21 @@
 # Concurrent web scraper
+
+## Requirements
+
+This crawler was written in 3.7.0 to take advantage of the latest `asyncio` features.
+
+Install required modules:
+
+```bash
+pip install -r requirements.txt
+```
+
+Run:
+
+```bash
+python crawler.py -u https://urltocrawl.com
+```
+
+## Results
+
+The resulting sitemap will be output in the root of this directory as `sitemap.html`