Create README.md for migrate-wicked

rust/agama-migrate-wicked/README.md

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+# Migrate wicked
+This project creates a `migrate-wicked` binary which is able to parse wicked xml configs and send them to a NetworkManager dbus service.
+## Architecture
+`migrate-wicked` uses agama as a library to communicate the parsed network state to NetworkManager
+but the binary is completely independent of any agama services and can be run standalone
+## Obtaining wicked xml config
+A wicked config xml can be generated by running `wicked show-config > wicked.xml` which can then be passed to `migrate-wicked`
+## Testing
+Running the migration on a live system isn't currently recommended. To test it's recommended to use a container
+(instructions how to set one up can be found [here](https://github.com/openSUSE/agama/blob/master/rust/agama-cli/doc/backend-for-testing.md))  
+Example configurations can be found under `tests`