add usage gif and new example

Author: goktug97

README.md

@@ -25,6 +25,7 @@ python setup.py install --user
 ```
 
 ## Usage
+![Usage Gif](https://raw.githubusercontent.com/goktug97/yet-another-spotify-lyrics/master/usage.gif)
 
 ``` bash
 spotify-lyrics
@@ -58,6 +59,22 @@ for_window [instance="Lyrics"] floating enable; [instance="Lyrics"] move positio
 for_window [instance="Lyrics"] resize set 644 388
 ```
 
+### Example Use Case (Emacs)
+Open the lyrics in a buffer.
+
+``` emacs-lisp
+(defun spotify-lyrics ()
+  (interactive)
+  (let ((string (shell-command-to-string "spotify-lyrics-once")))
+    (get-buffer-create "lyrics-buffer")
+    (switch-to-buffer-other-window "lyrics-buffer")
+    (with-current-buffer "lyrics-buffer"
+      (goto-char (point-max))
+      (erase-buffer)
+      (insert string)
+      (goto-line 1))))
+```
+
 ### Example Use Case (Conky)
 You can use spotify-lyrics-once to output the lyrics to the stdout and exit.
 If you have program that utilizes stdin, you can use this version.