initial work

README.md

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+
+
+first start:
+
+copy example-env to .env
+modify your user ID as USR
+EXPOSE to port exposed outside
+
+- data/ and home/ folders appear
+- create user by adding authorized_keys contents to users/[UID]-[username] file
+  - example:  `vim users/2000-user1`  <- copy id_rsa.pub contents there
+