docs: add README.md

README.md

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+# croc
+
+Easily and securely send things from one computer to another 
+
+<!-- metadata -->
+
+- **Category**: Utilities
+- **Status**: ❶💚
+- **Image**: [`croc`](https://hub.docker.com/r/schollz/croc),❶💚, upstream
+- **Healthcheck**: No
+- **Backups**: No
+- **Email**: No
+- **Tests**: No
+- **SSO**:  No
+
+<!-- endmetadata -->
+
+## Basic usage
+
+1. Set up Docker Swarm and [`abra`]
+2. `abra app new croc`
+3. `abra app secret generate -a <croc app name>` - this will generate server password
+4. `abra app deploy <croc app name>`
+done!
+
+now you can use croc. Remember to put your password when sending/receiving files!
+`croc --pass SERVER_PASSWORD --relay "server.address:9009" send [filename]` to send
+`croc --pass SERVER_PASSWORD --relay "server.address:9009"` to receive
+
+[`abra`]: https://git.coopcloud.tech/coop-cloud/abra