Update readme

readme.md

@@ -1,3 +1,23 @@
 # webdav
 
-(TODO)
+[![Build](https://img.shields.io/travis/hacdias/webdav.svg?style=flat-square)](https://travis-ci.org/hacdias/webdav)
+[![Go Report Card](https://goreportcard.com/badge/github.com/hacdias/webdav?style=flat-square)](https://goreportcard.com/report/hacdias/webdav)
+
+```webdav``` is a simple tool that creates a WebDAV server for you. By default, it runs on a random free port and supports JSON and YAML configuration. Here is a simple YAML configuration example:
+
+```yaml
+scope: /path/to/files
+port: 8080
+users:
+  - username: admin
+    password: admin
+  - username: basic
+    password: basic
+    modify:   false
+    rules:
+      - regex: false
+      - allow: false
+      - path: /some/file
+```
+
+You can specify the path to the configuration file using the `--config` flag. By default, it will search for a `config.{yaml,json}` file on your current working directory.