Merge pull request 'Fill Readme with info' (#1) from readme into master

Reviewed-on: #1

README.md

@@ -1,2 +1,22 @@
-# confluence-space-exporter
+# Confluence space exporter
+A little program to download Confluence spaces for offline usage or sharing with others.
 
+An index.html is exported which reflects the pagetree of the space. Optionally attachments
+are downloaded as well. Some cleanup is done to the Confluence specific HTML to be able
+to render it with normal CSS.
+
+## Usage
+```
+confluence-space-exporter --baseurl BASEURL --spacekey SPACEKEY --user USER --token TOKEN [--attachments]
+
+Options:
+  --baseurl BASEURL      Base URL of the Confluence instance (required), i.e. https://company.atlassian.net
+  --spacekey SPACEKEY    Spacekey to export (required)
+  --user USER            User used for authentication (required)
+  --token TOKEN          Token used for authentication (required)
+  --attachments, -a      Download attachments
+  --help, -h             display this help and exit
+```
+
+After a successful export you find a folder named like the space. Open the `index.html`
+in that folder with your browser to get started.