added firefly, tested and working

firefly/README.md

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+# Firefly iii
+
+## Overview
+Docker Hub: https://hub.docker.com/r/fireflyiii/core/tags
+Documentation: https://docs.firefly-iii.org/how-to/firefly-iii/installation/docker/
+Project: https://firefly-iii.org/
+Proxy Port: 8080
+Proxy Port Importer: 8080
+
+## Notes
+
+The Firefly III Data Importer will ask you for the Firefly III URL and a "Client ID".
+You can generate the Client ID at http://localhost/profile (after registering)
+The Firefly III URL is: http://app:8080
+Other URL's will give 500 | Server Error