Add readme

README.md

@@ -1,3 +1,15 @@
 # structify
 
-Transform JSON to Go structs
+Transform JSON to Go structs
+
+## Emacs Config
+```elisp
+(defun go-json-structify (beg end)
+  "Transform JSON in the selected region to Go Structs."
+  (interactive "*r")
+  (if (region-active-p)
+      (shell-command-on-region beg end "structify" (current-buffer) t)
+    (message "No active region")))
+
+(local-set-key (kbd "C-x C-j") 'go-json-structify) ; Structify json in region
+```