feat: add /files/{file} GET and DELETE methods

README.md

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+# sfu
+
+simple requirementsless, authenticationless file upload server
+
+## prod version
+
+WIP
+
+## dev version
+
+### using docker
+
+1. take a look at [docker-compose](docker-compose.yml) and modify the envvars accordingly. the default values **should work** as long as you're ok with a `files/` folder being created and **your user UID and GID are 1000**. if for some reason you need other ids, please add them like this:
+
+```docker-compose
+... 
+
+app:
+    build:
+      context: .
+      target: run_dev
+    environment:
+      - SFU_PORT=80
+      - SFU_FILES_DIR=./files
+      - gid=1234
+      - uid=1234
+...
+```
+
+### dockerless
+
+1. sfu needs two envvars to be set
+- `SFU_PORT`: the port to listen on
+- `SFU_FILES_DIR`: the directory to store files in
+2. run the server
+```shell
+go build
+SFU_PORT=80 SFU_FILES_DIR=./files ./main
+```