Add README

README.md

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+# QR Serve
+
+This is a small windows utility which serves a file over LAN,
+showing a QR code which can be scanned by other devices on the
+same network to retrieve the file.
+
+## How to use
+
+Drag and drop the file you want to serve to QR Serve, or right
+click the file and choose "Open with...", then find and pick
+the QR Serve binary.
+
+## Building QR Serve
+
+- Install Go and project dependencies
+- Get rsrc - `go install github.com/akavel/rsrc`
+- Run `release.sh`