add fly.io to readme

Author: peterj

README.md

@@ -1,6 +1,20 @@
 # My collection of Dagger modules
 
+## Fly.io Module
 
+This module enables you to do the following:
+
+- deploy an application to Fly.io
+
+### Usage
+
+To deploy an application to Fly.io, run the following command:
+
+```bash
+dagger call deploy --src [source-folder] --token=env:FLYIO_TOKEN
+```
+
+Note that the token can come from an environment variable or a file as well. Make sure you set that before running the deploy command.
 
 ## Envoy Proxy Module
 
@@ -9,7 +23,6 @@ This module enables you to do the following:
 - run an instance of Envoy proxy using the provided configuration
 - validate the Envoy configuration file
 
-
 ### Usage
 
 To run an instance of Envoy proxy and expose the ports on the host, run the following command:
@@ -26,4 +39,4 @@ dagger call validate-config  --config $PWD/examples/httpbin-sample.yaml
 
 ```console
 configuration '/etc/envoy/envoy.yaml' OK
-```
+```