Update README.md

README.md

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 # vkontakte-wall-cleaner
 Back up your wall contents, and remove potentially offending posts
+
+Usage:
+
+1. `npm install`
+2. Create new stand-alone VK app on https://vk.com/apps?act=manage , remember its client_id
+3. Get your token on https://oauth.vk.com/authorize?client_id=CLIENT_ID&redirect_uri=https://oauth.vk.com/blank.html&display=page&scope=8192&response_type=token&v=5.80 , where CLIENT_ID is app id from the previous step (8192 means that script will have access to wall only).
+4. Edit `index.js`, substituting token placeholder for your token.
+5. `node index`
+
+All posts are backed up, along with their photo attachments and up to 100 comments per post.
+
+All reposts, and all photo/album/video/audio posts without text are removed, except for those that have over 50 comments. The behaviour can be tweaked in line 123.