Add README

Author: chrisfosterelli

README.md

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+# simple-file-upload
+
+Docker container that provides an API endpoint for simple, secure file uploads.
+
+This docker container exposes a single, write-only endpoint at `/upload` that
+accepts a single file along with a `token` GET parameter for authentication. The
+authentication for the endpoint, along with the location of the uploaded file, 
+is configured using environment variables on the container.
+
+You can upload a file with curl like so:
+
+```bash
+> curl -XPOST -F 'data=@testuser-file.txt' dockerhost:3000/upload?key=TESTUSER
+```
+
+Multiple keys are supported, and every key is a 1:1 mapping to a location on 
+disk. Any additional uploads for a key will override the previous upload for
+that key. 
+
+The design goals for this container are a secure upload tool that:
+1. Can only be used to upload files, not download or read them
+2. Can only be used with a matching authentication key
+3. Can only upload to a single location per authentication key
+4. Can only override the previous upload, not store additional uploads
+
+# How to Use
+
+Basic usage is as follows:
+
+```
+docker run \
+  -e "KEY_TESTUSER=/uploads/testuser-file.txt" \
+  -v /my_local_dir/:/uploads/ \
+  -p 3000:3000 \
+  twostoryrobot/simple-file-upload
+```
+
+This will start the upload server, listening on port 3000. Files that are 
+uploaded with the key `TESTUSER` will be placed at `/uploads/testuser-file.txt`.
+You can use a volume to get easy access to this file on your host machine, or in
+another container.