add readme

README.md

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+# d-python-files
+
+simple lightweight python files server.
+
+```
+python3 -m http.simple -b 127.0.0.1 -p 8081
+```
+
+This listens for local requests on port 8081.
+
+This service is reverse-proxied by nginx.
+Users send requests to `files.charlesreid1.X/file
+and they are rewritten on the backend to 
+`127.0.0.1:8081/file`.
+
+This uses `debian:stretch-slim` (same as [nginx Dockerfile](https://github.com/nginxinc/docker-nginx/blob/4f5bae5928baee89433ecb20a50283546f217dfa/mainline/stretch/Dockerfile)).
+