Added syntax

README.md

@@ -6,4 +6,31 @@ Inspired by [magic-wormhole](https://github.com/warner/magic-wormhole) and
 [dat-cp](https://github.com/tom-james-watson/dat-cp). Initially published
 [here](https://www.reddit.com/r/ipfs/comments/9yyqi1/dat_dcpstyle_functionality_for_encrypted_assets/?utm_source=reddit-android).
 
-Have fun!
+# Usage
+
+## Send a file
+
+On machine A:
+
+```
+ipfs-wormhole.sh send <filename>
+```
+
+Will encrypt and add the file to IPFS, and output a tag (and copy it to the
+clipboard if xclip is installed).
+
+## Receive a file
+
+On machine B:
+
+```
+ipfs-wormhole.sh receive <tag>
+```
+
+Will retrieve the file over IPFS, decrypt it and save it locally.
+
+## Update from the github repo
+
+```
+ipfs-wormhole.sh update
+```