fix: add README

Author: theredrad

README.md

@@ -0,0 +1,25 @@
+# Lorem.space server
+The backend of https://lorem.space lives here.
+
+## Features
+* Scan the directory & categorize the image resources (only JPEG for now)
+* Provide HTTP API
+* Resize the image resources
+* Cache option to store the resized image as a file
+
+## How to run
+
+`$ go run main.go`
+
+`$ go run main.go --dir="/IMAGE/DIRECTORY/PATH"`
+
+### Options
+
+* `host`: host:port for the HTTP server (string)
+* `dir`: the path of image resources directory (string)
+* `cache`: enable cache (store the result as files in .cache directory) (bool)
+* `cdn`: CDN address to redirect to the cached file path, leave empty to write the file in the HTTP response (string)
+* `min-width`: minimum supported width (integer)
+* `max-width`: maximum supported width (integer)
+* `min-height`: minimum supported height (integer)
+* `max-height`: maximum supported height (integer)